The Seven Wonders of the Modern World:

Great Wall of China, China:
In c. 220 B.C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north. Construction continued up to the Ming dynasty (1368–1644), when the Great Wall became the world's largest military structure. Its historic and strategic importance is matched only by its architectural significance.

Petra, Jordan
Petra is a famous archaeological site in Jordan's southwestern desert. Dating to around 300 B.C., it was the capital of the Nabatean Kingdom. Accessed via a narrow canyon called Al Siq, it contains tombs and temples carved into pink sandstone cliffs, earning its nickname, the "Rose City." Perhaps its most famous structure is 45m-high Al Khazneh, a temple with an ornate, Greek-style facade, and known as The Treasury.

Christ the Redeemer, Brazil
Christ the Redeemer is an Art Deco statue of Jesus Christ in Rio de Janeiro, Brazil, created by French sculptor Paul Landowski and built by Brazilian engineer Heitor da Silva Costa, in collaboration with French engineer Albert Caquot. Romanian sculptor Gheorghe Leonida fashioned the face.

Machu Picchu, Peru
Machu Picchu is an Incan citadel set high in the Andes Mountains in Peru, above the Urubamba River valley. Built in the 15th century and later abandoned, it’s renowned for its sophisticated dry-stone walls that fuse huge blocks without the use of mortar, intriguing buildings that play on astronomical alignments and panoramic views. Its exact former use remains a mystery.

Chichen Itza, Mexico
Chichén Itzá is a complex of Mayan ruins on Mexico's Yucatán Peninsula. A massive step pyramid, known as El Castillo or Temple of Kukulcan, dominates the ancient city, which thrived from around 600 A.D. to the 1200s. Graphic stone carvings survive at structures like the ball court, Temple of the Warriors and the Wall of the Skulls. Nightly sound-and-light shows illuminate the buildings' sophisticated geometry.

Colosseum, Italy
The Colosseum is an oval 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 today, despite its age.

Taj Mahal, India
Agra is a city on the banks of the Yamuna river in the Indian state of Uttar Pradesh, about 210 kilometres south of the national capital New Delhi. With a population of roughly 1.6 million, Agra is the fourth-most populous city in Uttar Pradesh and the twenty-third most populous city in India.

Great Pyramid of Giza (honorary candidate), Egypt
The Great Pyramid of Giza is the oldest and largest of the pyramids in the Giza pyramid complex bordering present-day Giza in Greater Cairo, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.