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The Taj Mahal is an ivory-white marble mausoleum on the right bank of the river Yamuna in Agra, Uttar Pradesh, India. It was commissioned in 1631 by the fifth Mughal emperor, Shah Jahan to house the tomb of his beloved wife, Mumtaz Mahal; it also houses the tomb of Shah Jahan himself. The tomb is the centrepiece of a 17-hectare (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, which in 2023 would be approximately ₹35 billion. The construction project employed some 20,000 artisans under the guidance of a board of architects led by Ustad Ahmad Lahori, the emperor's court architect. Various types of symbolism have been employed in the Taj to reflect natural beauty and divinity.

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". 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, and in 2007 it was declared a winner of the New 7 Wonders of the World (2000–2007) initiative.

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The Great Wall of China is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe. Several walls were built from as early as the 7th century BC, with selective stretches later joined by Qin Shi Huang (220–206 BC), the first emperor of China. Little of the Qin wall remains. Later on, many successive dynasties built and maintained multiple stretches of border walls. The best-known sections of the wall were built by the Ming dynasty (1368–1644).

Apart from defense, 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 watchtowers, 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 frontier walls built by different dynasties have multiple courses. Collectively, they stretch from Liaodong in the east to Lop Lake in the west, from the present-day Sino–Russian border in the north to Tao River (Taohe) in the south; along an arc that roughly delineates the edge of the Mongolian steppe; spanning 21,196.18 km (13,170.70 mi) in total. Today, the defensive system of the Great Wall is generally recognized as one of the most impressive architectural feats in history.

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Petra, originally known to its inhabitants as Raqmu or Raqēmō, is a historic and archaeological city in southern Jordan. Famous for its rock-cut architecture and water conduit system, Petra is also called the "Rose City" because of the colour of the sandstone from which it is carved; it was famously called "a rose-red city half as old as time" in a poem of 1845 by John Burgon. It is adjacent to the mountain of Jabal Al-Madbah, in a basin surrounded by mountains forming the eastern flank of the Arabah valley running from the Dead Sea to the Gulf of Aqaba. Access to the city is through a famously picturesque 1.2-kilometre-long (3⁄4 mi) gorge called the Siq, which leads directly to the Khazneh.

The area around Petra has been inhabited from as early as 7000 BC, and the Nabataeans might have settled in what would become the capital city of their kingdom as early as the 4th century BC. Archaeological work has only discovered evidence of Nabataean presence dating back to the second century BC, by which time Petra had become their capital. The Nabataeans were nomadic Arabs who invested in Petra's proximity to the incense trade routes by establishing it as a major regional trading hub.

The trading business gained the Nabataeans considerable revenue and Petra became the focus of their wealth. Unlike their enemies, the Nabataeans were accustomed to living in the barren deserts and were able to repel attacks by taking advantage of the area's mountainous terrain. They were particularly skillful in harvesting rainwater, agriculture, and stone carving. Petra flourished in the 1st century AD, when its Al-Khazneh structure, possibly the mausoleum of Nabataean king Aretas IV, was constructed, and its population peaked at an estimated 20,000 inhabitants. Most of the famous rock-cut buildings, which are mainly tombs, date from this and the following period. Much less remains of the free-standing buildings of the city.

Although the Nabataean kingdom became a client state of the Roman Empire in the first century BC, it was only in 106 AD that it lost its independence. Petra fell to the Romans, who annexed Nabataea and renamed it as Arabia Petraea. Petra's importance declined as sea trade routes emerged, and after an earthquake in 363 destroyed many structures. In the Byzantine era, several Christian churches were built, but the city continued to decline and, by the early Islamic era, it was abandoned except for a handful of nomads. It remained unknown to the western world until 1812, when Swiss traveller Johann Ludwig Burckhardt rediscovered it.

It has been a UNESCO World Heritage Site since 1985. UNESCO has described Petra as "one of the most precious cultural properties of man's cultural heritage". In 2007, Petra was voted one of the New 7 Wonders of the World. Petra is a symbol of Jordan, as well as Jordan's most-visited tourist attraction. Tourist numbers peaked at 1.1 million in 2019, marking the first time that the figure rose above the 1 million mark. Tourism in the historical city was hit hard by the COVID-19 pandemic, but soon after started to pick up again, reaching 905,000 visitors in 2022.

Chichén Itzá was a large pre-Columbian city built by the Maya people of the Terminal Classic period. The archeological site is located in Tinúm Municipality, Yucatán State, Mexico.

Chichén Itzá 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.

Chichén Itzá 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 Chichén Itzá 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.

Chichén Itzá is one of the most visited archeological sites in Mexico with over 2.6 million tourists in 2017.

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The Colosseum is an elliptical amphitheatre in the centre of the city of Rome, Italy, just east of the Roman Forum. It is the largest ancient amphitheatre ever built, and is still the largest standing amphitheatre in the world, despite its age. Construction began under the emperor Vespasian in 72 and was completed in AD 80 under his successor and heir, Titus. Further modifications were made during the reign of Domitian (r. 81–96). The three emperors who were patrons of the work are known as the Flavian dynasty, and the amphitheatre was named the Flavian Amphitheatre by later classicists and archaeologists for its association with their family name (Flavius).

The Colosseum is built of travertine limestone, tuff (volcanic rock), and brick-faced concrete. It could hold an estimated 50,000 to 80,000 spectators at various points in its history, having an average audience of some 65,000; it was used for gladiatorial contests and public spectacles including animal hunts, executions, re-enactments of famous battles, and dramas based on Roman mythology, and briefly mock sea battles. 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 substantially ruined by earthquakes and stone robbers taking spolia, the Colosseum is still a renowned symbol of Imperial Rome and was listed as one of the New 7 Wonders of the World. It is one of Rome's most popular tourist attractions and has links to the 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 depicted on the Italian version of the 5 euro cent coin.

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Machu Picchu is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a 2,430-meter (7,970 ft) mountain ridge. Often referred to as the "Lost City of the Incas", it is the most familiar icon of the Inca Empire. It is located in the Machupicchu District within Urubamba Province[4] above the Sacred Valley, which is 80 kilometers (50 mi) northwest of Cusco. The Urubamba River flows past it, cutting through the Cordillera and creating a canyon with a tropical mountain climate. In reference to the site's name, for most English or Spanish speakers, the first 'c' in Picchu is silent.

The Inca civilization had no written language and, after the discovery by the Spanish soldier Baltasar Ocampo, by the end of the 16th century no more Europeans visited the site until the 19th century, so far as is known, so there are no written records of the site while it was in use. The names of the buildings, their supposed uses, and their inhabitants, are the product of modern archaeologists based on physical evidence, including tombs at the site. Machu Picchu was built in the classical Inca style, with polished dry-stone walls. Its three primary structures are the Intihuatana, the Temple of the Sun, and the Temple of the Three Windows. Most of the outlying buildings have been reconstructed in order to give visitors a better idea of how they originally appeared. By 1976, 30 percent of Machu Picchu had been restored and restoration continues. Most recent archaeologists believe that Machu Picchu was constructed as an estate for the Inca emperor Pachacuti (1438–1472). The Incas built the estate around 1450 but abandoned it a century later, at the time of the Spanish conquest. According to the new AMS radiocarbon dating, it was occupied from c. 1420–1532. Historical research published in 2022 claims that the site was probably called Huayna Picchu by the Inca people themselves, as it exists on the smaller peak of the same name.

Machu Picchu was declared a Peruvian Historic Sanctuary in 1982 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.

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Christ The Redeemer is an Art Deco statue of Jesus Christ in Rio de Janeiro, Brazil, created by French-Polish sculptor Paul Landowski and built by Brazilian engineer Heitor da Silva Costa, in collaboration with French engineer Albert Caquot. Romanian sculptor Gheorghe Leonida sculpted the face. Constructed between 1922 and 1931, the statue is 30 metres (98 ft) high, excluding its 8-metre (26 ft) pedestal. The arms stretch 28 metres (92 ft) wide. It is made of reinforced concrete and soapstone. Christ The Redeemer differs considerably from its original design, as the initial plan was a large Christ with a globe in one hand and a cross in the other. Although the project organisers originally accepted the design, it later changed to the statue of today, with the arms spread out 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 National Park overlooking the city of Rio de Janeiro. This statue is the largest Art Deco style sculpture in the world. A symbol of Christianity around the world, the statue has also become a cultural icon of both Rio de Janeiro and Brazil and was voted one of the New 7 Wonders of the World.

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