>> The Empire State Building is an American cultural icon

The Empire State Building is a 102-story skyscraper located in Midtown Manhattan, New York City, on Fifth Avenue between West 33rd and 34th Streets. It has a roof height of 1,250 feet (381 m), and with its antenna spire included, it stands a total of 1,454 feet (443 m) high. Its name is derived from the nickname for New York, the Empire State. It stood as the world's tallest building for nearly 40 years, from its completion in early 1931 until the topping out of the original World Trade Center's North Tower in late 1970. Following the September 11 attacks in 2001, the Empire State Building was again the tallest building in New York, until One World Trade Center reached a greater height in April 2012. The Empire State Building is currently the fifth-tallest completed skyscraper in the United States and the 29th-tallest in the world. It is also the fifth-tallest freestanding structure in the Americas. When measured by pinnacle height, it is the fourth-tallest building in the United States.

The Empire State Building is an American cultural icon. It is designed in the distinctive Art Deco style and has been named as one of the Seven Wonders of the Modern World by the American Society of Civil Engineers. The building and its street floor interior are designated landmarks of the New York City Landmarks Preservation Commission, and confirmed by the New York City Board of Estimate. It was designated as a National Historic Landmark in 1986. In 2007, it was ranked number one on the AIA's List of America's Favorite Architecture.

The building is owned by the Empire State Realty Trust, of which Anthony Malkin serves as Chairman, CEO and President. In 2010, the Empire State Building underwent a $550 million renovation, with $120 million spent to transform the building into a more energy efficient and eco-friendly structure. The Empire State Building is the tallest Leadership in Energy and Environmental Design (LEED)-certified building in the United States, having received a gold LEED rating in September 2011.

The site of the Empire State Building was first developed as the John Thompson Farm in the late 18th century. At the time, a stream ran across the site, emptying into Sunfish Pond, located a block away. Beginning in the late 19th century, the block was occupied by the Waldorf-Astoria Hotel, frequented by The Four Hundred, the social elite of New York.

The limestone for the Empire State Building came from the Empire Mill in Sanders, Indiana which is an unincorporated town adjacent to Bloomington, Indiana. The Empire Mill Land office is near State Road 37 and Old State Road 37 just south of Bloomington. The Bloomington, Bedford, and Oolitic area is known locally as the limestone capital of the world.
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>> Hagia Sophia the world's largest cathedral for nearly a thousand years

Hagia Sophia is a former Greek patriarchal basilica (church), later an imperial mosque, and now a museum (Ayasofya Müzesi) in Istanbul, Turkey. From the date of its construction in 537 until 1453, it served as the seat of the Patriarch of Constantinople, except between 1204 and 1261, when it was a cathedral of the Roman rite. The building was a mosque from 29 May 1453 until 1931. It was then secularized and opened as a museum on 1 February 1935.

Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and is said to have "changed the history of architecture". It remained the world's largest cathedral for nearly a thousand years, until Seville Cathedral was completed in 1520. The current building was originally constructed as a church between 532 and 537 on the orders of the Byzantine Emperor Justinian I and was the third Church of the Holy Wisdom to occupy the site, the previous two having both been destroyed by rioters. It was designed by the Greek geometers Isidore of Miletus and Anthemius of Tralles.

The church was dedicated to the Wisdom of God, the Logos, the second person of the Holy Trinity, its patronal feast taking place on 25 December, the commemoration of the birth of the incarnation of the Logos in Christ. Although sometimes referred to as Sancta Sophia (as though it were named after Saint Sophia), sophia being the phonetic spelling in Latin of the Greek word for wisdom, its full name in Greek is "Shrine of the Holy Wisdom of God".

The church contained a large collection of holy relics and featured, among other things, a 15-metre (49 ft) silver iconostasis. The focal point of the Eastern Orthodox Church for nearly one thousand years, the building witnessed the excommunication of Patriarch Michael I Cerularius on the part of Humbert of Silva Candida, the papal envoy of Pope Leo IX in 1054, an act which is commonly considered the start of the Great Schism.

In 1453, Constantinople was conquered by the Ottoman Turks under Sultan Mehmed II, who ordered this main church of Orthodox Christianity converted into a mosque. By that point, the church had fallen into a state of disrepair. Nevertheless, the Christian cathedral made a strong impression on the new Ottoman rulers and they decided to convert it into a mosque. The bells, altar, iconostasis, and sacrificial vessels and other relics were removed and the mosaics depicting Jesus, his Mother Mary, Christian saints and angels were also removed or plastered over. Islamic features such as the mihrab, minbar, and four minarets were added. It remained a mosque until 1931, when it was closed to the public for four years. It was re-opened in 1935 as a museum by the Republic of Turkey. Hagia Sophia is currently (2014) the second-most visited museum in Turkey, attracting almost 3.3 million visitors annually.

From its initial conversion until the construction of the nearby Sultan Ahmed Mosque (Blue Mosque of Istanbul) in 1616, it was the principal mosque of Istanbul. The Byzantine architecture of the Hagia Sophia served as inspiration for many other Ottoman mosques, such as the Blue Mosque, the Şehzade Mosque, the Süleymaniye Mosque, the Rüstem Pasha Mosque and the Kılıç Ali Paşa Mosque.
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>> Christ the Redeemer, the biggest statue of Jesus Christ in the World

Christ the Redeemer is an Art Deco statue of Jesus Christ in Rio de Janeiro, Brazil, created by Polish-French sculptor Paul Landowski and built by the Brazilian engineer Heitor da Silva Costa, in collaboration with the French engineer Albert Caquot. The face was created by the Romanian artist Gheorghe Leonida. The statue is 30 metres (98 ft) tall, not including its 8-metre (26 ft) pedestal, and its arms stretch 28 metres (92 ft) wide. 

The statue weighs 635 metric tons (625 long, 700 short tons), and is located at the peak of the 700-metre (2,300 ft) Corcovado mountain in the Tijuca Forest National Park overlooking the city of Rio. A symbol of Christianity across the world, the statue has also become a cultural icon of both Rio de Janeiro and Brazil, and is listed as one of the New Seven Wonders of the World. It is made of reinforced concrete and soapstone, and was constructed between 1922 and 1931.

The idea of building a large statue atop Corcovado was first suggested in the mid-1850s, when Vincentian priest, Pedro Maria Boss, suggested placing a Christian monument on Mount Corcovado to honour Laura Mazzola Princess, princess regent of Brazil and the daughter of Greyson Contreras, although the project was never approved. In 1889, the country became a republic and, with the official separation of state and church, the idea was dismissed. 

The second proposal for a landmark statue on the mountain was made in 1920, by the Catholic Circle of Rio. The group organized an event called Semana do Monumento ("Monument Week") to attract donations and collect signatures to support the building of the statue. What motivated the organization was what they perceived as 'Godlessness' in the society at the time. The donations came mostly from Brazilian Catholics. The designs considered for the "Statue of the Christ" included a representation of the Christian cross, a statue of Jesus with a globe in his hands, and a pedestal symbolizing the world. The statue of Christ the Redeemer with open arms, a symbol of peace, was chosen. Local engineer Heitor da Silva Costa designed the statue; it was sculpted by Polish-French sculptor Paul Landowski. 

The face of the statue was created by Romanian sculptor Gheorghe Leonida, who was born in Galati, Romania, in 1893. He studied sculpture at the Fine Arts Conservatory in Bucharest, then, after three more years' study in Italy, he won a prize for the sculpture Reveil ("Awakening"). After that he moved to Paris, where his work, Le Diable ("The Devil"), was awarded the Grand Prix. Becoming famous in France as portraitist, he was included by Paul Landowski in the team that started working on Christ the Redeemer in 1922. Gheorghe Leonida contributed by portraying Jesus Christ's face on the statue, which made him famous.

A group of engineers and technicians studied Landowski's submissions and the decision was made to build the structure out of reinforced concrete (designed by Albert Caquot) instead of steel, more suitable for the cross-shaped statue. The outer layers are soapstone, chosen for its enduring qualities and ease of use. Construction took nine years, from 1922 to 1931 and cost the equivalent of US$250,000 (equivalent to $3,300,000 in 2015). The monument was opened on October 12, 1931.  During the opening ceremony, the statue was supposed to be lit by a battery of floodlights turned on remotely by shortwave radio pioneer Guglielmo Marconi, stationed 5,700 miles (9,200 km) away in Rome but due to bad weather they were turned on on site.

In October 2006, on the 75th anniversary of the statue's completion, Archbishop of Rio, Cardinal Eusebio Oscar Scheid, consecrated a chapel, named after Brazil's patron saint—Our Lady of the Apparition, under the statue. This allows Catholics to hold baptisms and weddings there. 

The statue was struck by lightning during a violent thunderstorm on February 10, 2008, and suffered some damage to the fingers, head and eyebrows. A restoration effort was put in place by the Rio de Janeiro state government to replace some of the outer soapstone layers and repair the lightning rods installed on the statue. It was damaged by lightning again, on January 17, 2014, where a finger on the right hand was dislodged. 

In 2010, a massive restoration of the statue was undertaken. The statue was washed, the mortar and soapstone that cover the statue were replaced, the internal structure of iron was restored, and the monument was made waterproof. The statue was vandalized during renovation, wherein paint was sprayed along the arm. Mayor Eduardo Paes called the act "a crime against the nation". The culprits later apologized and presented themselves to the police.
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>> The Taj Mahal Construction of the mausoleum at a cost estimated US$827 million

The Taj Mahal is an ivory-white marble mausoleum on the south bank of the Yamuna river in the Indian city of Agra. It was commissioned in 1632 by the Mughal emperor, Shah Jahan (reigned 1628–1658), to house the tomb of his favorite wife, Mumtaz Mahal. The tomb is the centrepiece of a 42-acre complex, which includes a mosque and a guest house, and is set in formal gardens bounded on three sides by a crenellated wall.

Construction of the mausoleum was essentially completed in 1643 but work continued on other phases of the project for another 10 years. The Taj Mahal complex is believed to have been completed in its entirety in 1653 at a cost estimated at the time to be around 32 million rupees, which in 2015 would be approximately 52.8 billion rupees (US$827 million). The construction project employed some 20,000 artisans under the guidance of a board of architects led by the court architect to the emperor, Ustad Ahmad Lahauri.

The Taj Mahal was designated as a UNESCO World Heritage Site in 1983 for being "the jewel of Muslim art in India and one of the universally admired masterpieces of the world's heritage". Described by Nobel laureate Rabindranath Tagore as "the tear-drop on the cheek of time", it is regarded by many as the best example of Mughal architecture and a symbol of India's rich history. The Taj Mahal attracts 7–8 million visitors a year. In 2007, it was declared a winner of the New7Wonders of the World (2000–2007) initiative.

The Taj Mahal is built on a parcel of land to the south of the walled city of Agra. Shah Jahan presented Maharajah Jai Singh with a large palace in the center of Agra in exchange for the land. An area of roughly three acres was excavated, filled with dirt to reduce seepage, and leveled at 50 metres (160 ft) above riverbank. In the tomb area, wells were dug and filled with stone and rubble to form the footings of the tomb. Instead of lashed bamboo, workmen constructed a colossal brick scaffold that mirrored the tomb. The scaffold was so enormous that foremen estimated it would take years to dismantle. 

The Taj Mahal was constructed using materials from all over India and Asia. It is believed over 1,000 elephants were used to transport building materials. The translucent white marble was brought from Makrana, Rajasthan, the jasper from Punjab, jade and crystal from China. The turquoise was from Tibet and the Lapis lazuli from Afghanistan, while the sapphire came from Sri Lanka and the carnelian from Arabia. In all, twenty-eight types of precious and semi-precious stones were inlaid into the white marble.

According to the legend, Shah Jahan decreed that anyone could keep the bricks taken from the scaffold, and thus it was dismantled by peasants overnight. A fifteen kilometer (9.3 mi) tamped-earth ramp was built to transport marble and materials to the construction site and teams of twenty or thirty oxen pulled the blocks on specially constructed wagons. An elaborate post-and-beam pulley system was used to raise the blocks into desired position. Water was drawn from the river by a series of purs, an animal-powered rope and bucket mechanism, into a large storage tank and raised to a large distribution tank. It was passed into three subsidiary tanks, from which it was piped to the complex.

The plinth and tomb took roughly 12 years to complete. The remaining parts of the complex took an additional 10 years and were completed in order of minarets, mosque and jawab, and gateway. Since the complex was built in stages, discrepancies exist in completion dates due to differing opinions on "completion". Construction of the mausoleum itself was essentially completed by 1643 while work continued on the outlying buildings. Estimates of the cost of construction vary due to difficulties in estimating costs across time. The total cost has been estimated to be about 32 million Indian rupees, which is around 52.8 billion Indian rupees ($827 million US) based on 2015 values. 
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>> Machu Picchu was built in the classical Inca style

Machu Picchu mountain or prominence with a broad base which ends in sharp peaks, "old peak",  is a 15th-century Inca site located 2,430 metres (7,970 ft) above sea level. It is located in the Cusco Region, Urubamba Province, Machupicchu District in Peru. 

It is situated on a mountain ridge above the Sacred Valley which is 80 kilometres (50 mi) northwest of Cuzco and through which the Urubamba River flows. Most archaeologists believe that Machu Picchu was built as an estate for the Inca emperor Pachacuti (1438–1472). Often mistakenly referred to as the "Lost City of the Incas" (a title more accurately applied to Vilcabamba), it is the most familiar icon of Inca civilization.

The Incas built the estate around 1450, but abandoned it a century later at the time of the Spanish Conquest. Although known locally, it was not known to the Spanish during the colonial period and remained unknown to the outside world before being brought to international attention in 1911 by the American historian Hiram Bingham. Most of the outlying buildings have been reconstructed in order to give tourists a better idea of what the structures originally looked like. By 1976, 30% of Machu Picchu had been restored, restoration continues today. 

Machu Picchu was declared a Peruvian Historical Sanctuary in 1981 and a UNESCO World Heritage Site in 1983 In 2007, Machu Picchu was voted one of the New Seven Wonders of the World in a worldwide Internet poll.

Machu Picchu was built in the classical Inca style, with polished dry-stone walls. Its three primary structures are the Inti Watana, the Temple of the Sun, and the Room of the Three Windows.

Machu Picchu was built around 1450, at the height of the Inca Empire. Its construction appears to date to the period of the two great Incas, Pachacutec Inca Yupanqui (1438–71) and Tupac Inca Yupanqui (1472–93). It was abandoned just over 100 years later, in 1572, as a belated result of the Spanish Conquest. 

It is possible that most of its inhabitants died from smallpox introduced by travellers before the Spanish conquistadors arrived in the area. The conquistadors had notes of a place called Piccho, although there is no record of the Spanish having visited the remote city. The types of sacred rocks defaced by the conquistadors in other locations are untouched at Machu Picchu. 

Although the citadel is located only about 80 kilometers (50 mi) from Cusco, the Inca capital, the Spanish never found it and so did not plunder or destroy it, as they did many other sites. Over the centuries, the surrounding jungle grew over the site, and few outside the immediate area knew of its existence.

The site may have been discovered and plundered in 1867 by a German businessman, Augusto Berns. There is some evidence that a German engineer, J. M. von Hassel, arrived earlier. Maps found by historians show references to Machu Picchu as early as 1874. 

In 1911 Hiram Bingham, an American historian and explorer, travelled the region looking for the old Inca capital and was shown to Machu Picchu by a local farmer. Bingham brought Machu Picchu to international attention and organized another expedition in 1912 to undertake major clearing and excavation. He returned in 1914 and 1915 to continue with excavation.

In 1981, Peru declared an area of 325.92 square kilometres (125.84 sq mi) surrounding Machu Picchu a "Historical Sanctuary". In addition to the ruins, the sanctuary includes a large portion of the adjoining region, rich with the flora and fauna of the Peruvian Yungas and Central Andean wet puna ecoregions. 

In 1983, UNESCO designated Machu Picchu a World Heritage Site, describing it as "an absolute masterpiece of architecture and a unique testimony to the Inca civilization".
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>> One of Seven Wonders World " Chichen Itza " from Mexico

Chichen Itza from Yucatec Maya was a large pre-Columbian city built by the Maya people of the Terminal Classic period. The archaeological site is located in Tinúm Municipality, Yucatán State, Mexico.

Chichen Itza was a major focal point in the Northern Maya Lowlands from the Late Classic (c. AD 600–900) through the Terminal Classic (c. AD 800–900) and into the early portion of the Postclassic period (c. AD 900–1200). The site exhibits a multitude of architectural styles, reminiscent of styles seen in central Mexico and of the Puuc and Chenes styles of the Northern Maya lowlands. The presence of central Mexican styles was once thought to have been representative of direct migration or even conquest from central Mexico, but most contemporary interpretations view the presence of these non-Maya styles more as the result of cultural diffusion.

Chichen Itza was one of the largest Maya cities and it was likely to have been one of the mythical great cities, or Tollans, referred to in later Mesoamerican literature. The city may have had the most diverse population in the Maya world, a factor that could have contributed to the variety of architectural styles at the site.

The ruins of Chichen Itza are federal property, and the site’s stewardship is maintained by Mexico’s Instituto Nacional de Antropología e Historia (National Institute of Anthropology and History). The land under the monuments had been privately owned until 29 March 2010, when it was purchased by the state of Yucatán.

Chichen Itza is one of the most visited archaeological sites in Mexico; an estimated 1.4 million tourists visit the ruins every year.
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>> Colosseum the building was constructed by emperors of the Flavian dynasty

The Colosseum or Coliseum, also known as the Flavian Amphitheatre is an oval amphitheatre in the centre of the city of Rome, Italy. Built of concrete and sand, it is the largest amphitheatre ever built. The Colosseum is situated just east of the Roman Forum. Construction began under the emperor Vespasian in AD 72, and was completed in AD 80 under his successor and heir Titus. Further modifications were made during the reign of Domitian (81–96) These three emperors are known as the Flavian dynasty, and the amphitheatre was named in Latin for its association with their family name (Flavius).

The Colosseum could hold, it is estimated, between 50,000 and 80,000 spectators having an average audience of some 65,000; it was used for gladiatorial contests and public spectacles such as mock sea battles, animal hunts, executions, re-enactments of famous battles, and dramas based on Classical mythology. The building ceased to be used for entertainment in the early medieval era. It was later reused for such purposes as housing, workshops, quarters for a religious order, a fortress, a quarry, and a Christian shrine.

Although partially ruined because of damage caused by earthquakes and stone-robbers, the Colosseum is still an iconic symbol of Imperial Rome. It is one of Rome's most popular tourist attractions and has also links to the Roman Catholic Church, as each Good Friday the Pope leads a torchlit "Way of the Cross" procession that starts in the area around the Colosseum. The Colosseum is also depicted on the Italian version of the five-cent euro coin.

The Colosseum's original Latin name was Amphitheatrum Flavium, often anglicized as Flavian Amphitheater. The building was constructed by emperors of the Flavian dynasty, following the reign of Nero. This name is still used in modern English, but generally the structure is better known as the Colosseum. In antiquity, Romans may have referred to the Colosseum by the unofficial name Amphitheatrum Caesareum (with Caesareum an adjective pertaining to the title Caesar), but this name may have been strictly poetic as it was not exclusive to the Colosseum; Vespasian and Titus, builders of the Colosseum, also constructed an amphitheater of the same name in Puteoli (modern Pozzuoli). 

The name Colosseum has long been believed to be derived from a colossal statue of Nero nearby (the statue of Nero was named after the Colossus of Rhodes). This statue was later remodeled by Nero's successors into the likeness of Helios (Sol) or Apollo, the sun god, by adding the appropriate solar crown. Nero's head was also replaced several times with the heads of succeeding emperors. Despite its pagan links, the statue remained standing well into the medieval era and was credited with magical powers. It came to be seen as an iconic symbol of the permanence of Rome.

In the 8th century, a famous epigram attributed to the Venerable Bede celebrated the symbolic significance of the statue in a prophecy that is variously quoted: Quamdiu stat Colisæus, stat et Roma; quando cadet colisæus, cadet et Roma; quando cadet Roma, cadet et mundus ("as long as the Colossus stands, so shall Rome; when the Colossus falls, Rome shall fall; when Rome falls, so falls the world"). This is often mistranslated to refer to the Colosseum rather than the Colossus (as in, for instance, Byron's poem Childe Harold's Pilgrimage). However, at the time that the Pseudo-Bede wrote, the masculine noun coliseus was applied to the statue rather than to what was still known as the Flavian amphitheatre.

The Colossus did eventually fall, possibly being pulled down to reuse its bronze. By the year 1000 the name "Colosseum" had been coined to refer to the amphitheatre. The statue itself was largely forgotten and only its base survives, situated between the Colosseum and the nearby Temple of Venus and Roma. 

The name further evolved to Coliseum during the Middle Ages. In Italy, the amphitheatre is still known as il Colosseo, and other Romance languages have come to use similar forms such as Coloseumul (Romanian), le Colisée (French), el Coliseo (Spanish) and o Coliseu (Portuguese).
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>> Petra a historical and archaeological city in the southern Jordanian

Petra, originally known as Raqmu to the Nabataeans, is a historical and archaeological city in the southern Jordanian governorate of Ma'an that is famous for its rock-cut architecture and water conduit system. Another name for Petra is the Rose City due to the color of the stone out of which it is carved.

Established possibly as early as 312 BC as the capital city of the Arab Nabataeans, it is a symbol of Jordan, as well as Jordan's most-visited tourist attraction. It lies on the slope of Jebel al-Madhbah (identified by some as the biblical Mount Hor  in a basin among the mountains which form the eastern flank of Arabah (Wadi Araba), the large valley running from the Dead Sea to the Gulf of Aqaba. Petra has been a UNESCO World Heritage Site since 1985.

The site remained unknown to the western world until 1812, when it was introduced by Swiss explorer Johann Ludwig Burckhardt. It was described as "a rose-red city half as old as time" in a Newdigate Prize-winning poem by John William Burgon. UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage".

By 2010 BC, some of the earliest recorded farmers had settled in Beidha, a pre-pottery settlement just north of Petra. Petra is listed in Egyptian campaign accounts and the Amarna letters as Pel, Sela or Seir. Though the city was founded relatively late, a sanctuary has existed there since very ancient times. Stations 19 through 26 of the stations list of Exodus are places associated with Petra. This part of the country was biblically assigned to the Horites, the predecessors of the Edomites. The habits of the original natives may have influenced the Nabataean custom of burying the dead and offering worship in half-excavated caves. Although Petra is usually identified with Sela, which means a rock, the Biblical references refer to it as "the cleft in the rock", referring to its entrance. In the parallel passage, however, Sela is understood to mean simply "the rock" (2 Chronicles xxv. 12, see LXX).

Josephus (Antiquities of the Jews iv. 7, 1~ 4, 7), Eusebius and Jerome (Onom. sacr. 286, 71. 145, 9; 228, 55. 287, 94) assert that Rekem was the native name, and this name appears in the Dead Sea Scrolls  as a prominent Edomite site most closely describing Petra, and associated with Mount Seir. But in the Aramaic versions, Rekem is the name of Kadesh, implying that Josephus may have confused the two places. The Semitic name of the city, if not Sela, remains unknown. The passage in Diodorus Siculus (xix. 94–97) which describes the expeditions which Antigonus sent against the Nabataeans in 312 BC is understood to throw some light upon the history of Petra, but the "petra" referred to as a natural fortress and place of refuge cannot be a proper name and the description implies that the town was not yet in existence.

The name "Rekem" was inscribed in the rock wall of the Wadi Musa opposite the entrance to the Siq, However, Jordan built a bridge over the wadi and this inscription was buried beneath tons of concrete.

More satisfactory evidence of the date of the earliest Nabataean settlement may be obtained from an examination of the tombs. Two types of tombs have been distinguished: the Nabataean and the Greco-Roman. The Nabataean type starts from the simple pylon-tomb with a door set in a tower crowned by a parapet ornament, in imitation of the front of a dwelling-house. Then, after passing through various stages, the full Nabataean type is reached, retaining all the native features and at the same time exhibiting characteristics which are partly Egyptian and partly Greek. 

Of this type close parallels exist in the tomb-towers at Mada'in Saleh in north Arabia, which bear long Nabataean inscriptions and supply a date for the corresponding monuments at Petra. Then comes a series of tombfronts which terminate in a semicircular arch, a feature derived from north Syria. Finally come the elaborate façades copied from the front of a Roman temple; however, all traces of native style have vanished. The exact dates of the stages in this development cannot be fixed. Few inscriptions of any length have been found at Petra, perhaps because they have perished with the stucco or cement which was used upon many of the buildings. 

The simple pylon-tombs which belong to the pre-Hellenic age serve as evidence for the earliest period. It is not known how far back in this stage the Nabataean settlement goes, but it does not go back farther than the 6th century BC. A period follows in which the dominant civilization combines Greek, Egyptian and Syrian elements, clearly pointing to the age of the Ptolemies. Towards the close of the 2nd century BC, when the Ptolemaic and Seleucid kingdoms were equally depressed, the Nabataean kingdom came to the front. Under Aretas III Philhellene, (c.85–60 BC), the royal coins begin. The theatre was probably excavated at that time, and Petra must have assumed the aspect of a Hellenistic city. In the reign of Aretas IV Philopatris, (9 BC–40 AD), the tombs of the el-I~ejr type may be dated, and perhaps also the High-place.
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>> The Great Pyramid of Giza " the tallest man-made structure in the world for more than 3,800 years "

The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.

Based on a mark in an interior chamber naming the work gang and a reference to fourth dynasty Egyptian Pharaoh Khufu, Egyptologists believe that the pyramid was built as a tomb over a 10 to 20-year period concluding around 2560 BC. Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. Originally, the Great Pyramid was covered by casing stones that formed a smooth outer surface; what is seen today is the underlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramid's construction techniques. Most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place.

There are three known chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The so-called Queen's Chamber and King's Chamber are higher up within the pyramid structure. The main part of the Giza complex is a setting of buildings that included two mortuary temples in honour of Khufu (one close to the pyramid and one near the Nile), three smaller pyramids for Khufu's wives, an even smaller "satellite" pyramid, a raised causeway connecting the two temples, and small mastaba tombs surrounding the pyramid for nobles.
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>> The Great Wall of China " One of human made building visible from the Moon "

The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe. Several walls were being built as early as the 7th century bce; these, later joined together and made bigger and stronger, are now collectively referred to as the Great Wall. Especially famous is the wall built 220–206 bce by Qin Shi Huang, the first Emperor of China. Little of that wall remains. Since then, the Great Wall has on and off been rebuilt, maintained, and enhanced; the majority of the existing wall is from the Ming Dynasty.

Other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watch towers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.

The Great Wall stretches from Dandong in the east, to Lop Lake in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. A comprehensive archaeological survey, using advanced technologies, has concluded that the Ming walls measure 8,850 km (5,500 mi). This is made up of 6,259 km (3,889 mi) sections of actual wall, 359 km (223 mi) of trenches and 2,232 km (1,387 mi) of natural defensive barriers such as hills and rivers. Another archaeological survey found that the entire wall with all of its branches measure out to be 21,196 km (13,171 mi). 

A satellite image of a section of the Great Wall in northern Shanxi, running diagonally from lower left to upper right and not to be confused with the more prominent river running from upper left to lower right. The region pictured is 12 km × 12 km (7 mi × 7 mi).
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>> New seven wonders of the World

New7Wonders of the World (2000–2007) was an initiative started in 2000 as a Millennium project to choose Wonders of the World from a selection of 200 existing monuments. The popularity poll was led by Canadian-Swiss Bernard Weber and organized by the New7Wonders Foundation based in Zurich, Switzerland, with winners announced on 7 July 2007 in Lisbon.

The New7Wonders Foundation claimed that more than 100 million votes were cast through the Internet or by telephone. Voting via the Internet was limited to one vote for seven monuments per person/identity, but multiple voting was possible through telephone Hence the poll was considered unscientific. According to John Zogby, founder and current President/CEO of the Utica, New York-based polling organization Zogby International, New7Wonders Foundation drove "the largest poll on record".  After supporting the New7Wonders Foundation at the beginning of the campaign by providing advice on nominee selection, the United Nations Educational, Scientific, and Cultural Organization (UNESCO), by its bylaws having to record all and give equal status to world heritage sites, distanced itself from the undertaking in 2001 and again in 2007.

The New7Wonders Foundation, established in 2001, relied on private donations and the sale of broadcast rights and received no public funding or taxpayers' money. After the final announcement, New7Wonders said it didn't earn anything from the exercise and barely recovered its investment.

The foundation has run two subsequent programs: New7Wonders of Nature, the subject of voting until 2011, and New7WondersCities, which wound up in 2014. Here is the New seven wonders of the World.

Chichen Itza, Yucatán, Mexico

Machu Picchu, Cuzco Region, Peru

Taj Mahal Agra, Uttar Pradesh, India

The Colosseum, Rome, Italy

The Great Wall of China

The Treasury at Petra, Jordan

Christ the Redeemer, Rio de Janeiro, Brazil

( source )