2. Stonehenge,Stonehenge, a massive monument on the Salisbury Plain in southern England, is the most famous of all prehistoric structures. 2000 B.C.

3. The Great Sphinx of Egypt, one of the wonders of ancient Egyptian architecture, adjoins the pyramids of Giza and has a length of 240 ft.Great Sphinx 4,500 years old

4. The Parthenon of Greece, built on the Acropolis in Athens, was the chief temple to the goddess Athena. Parthenon Acropolis 438 B.C.

5. The Colosseum of Rome, the largest and most famous of the Roman amphitheaters, was opened for use A.D. 80.Colosseum Elliptical in shape, it consisted of three storeys. It was principally used for gladiatorial combat and could seat between 40,000 and 50,000 spectators.

6. The Tower of London is a group of buildings and towers along the north bank of the Thames.Tower of London The central White Tower, begun in 1078 during the reign of William the Conqueror, was originally a fortress and royal residence, but was later used as a prison. The Bloody Tower is associated with Anne Boleyn.

7. Machu PicchuMachu Picchu is an ancient Inca fortress in the Andes Mountains of Peru. the mid-15th century

8. Notre-Dame de Paris Notre-Dame de Paris (begun in 1163), one of the great examples of Gothic architecture, is a twin- towered church.

9. The Eiffel Tower, in Paris, was built for the Exposition of 1889 by Alexandre Gustave Eiffel. It is 984 ft high (1,056 ft including the television tower).Eiffel Tower,

10. The Taj Mahal (1632–1650), at Agra, India, built by Shah Jahan as a tomb for his wife, is considered as the most beautiful building in the world.Taj Mahal

11. The Guggenheim Bilbao Museum (1993–97) in Bilbao, Spain, was designed by Frank Gehry.

12. The Great Wall of China (begun c. 214 B.C.), designed specifically as a defense against nomadic tribes, has large watchtowers that could be called buildings. It was erected by Emperor Ch'in Shih Huang Ti and is 1,400 mi long. Built mainly of earth and stone, it varies in height between 18 and 30 ft.Great Wall of China

13. The State Hermitage is a museum of art and culture in Saint Petersburg, Russia. One of the largest and oldest museums of the world, it was founded in 1764 by Catherine the Great and has been opened to the public since 1852. museumSaint PetersburgRussiaCatherine the Great

14. The Empire State Building (1930– 1931) is one of the most popular tourist attractions in Manhattan.Empire State Building Rising to 1,250 ft (not including the mast), it remained the tallest building in the world until the 1970s.

15. San Francisco's Golden Gate Bridge, completed in 1937, is one of the most recognizable structures in the United States. Designed by Joseph B. Strauss, this elegant suspension bridge has a main span of 4,200 ft. Golden Gate Bridge,

16. The Petronas Twin Towers are skyscrapers in Kuala Lumpur, Malaysia.skyscrapersKuala LumpurMalaysia They were the tallest buildings in the world from 1998 to 2004 until surpassed by Taipei 101, but remain the tallest twin buildings in the world ever built, surpassing the World Trade Center.tallest buildingsworldTaipei 101 tallest twin buildingsWorld Trade Center The building is the landmark of Kuala Lumpur.

17. Taipei 101, formerly known as the Taipei World Financial Center, is a landmark skyscraper located in Xinyi District, Taipei, Republic of China (Taiwan).landmark Xinyi DistrictTaipei Republic of ChinaTaiwan The building ranked officially as the world's tallest from 2004 until the opening of the Burj Khalifa in Dubai in 2010. world's tallestBurj KhalifaDubai

18. Burj Khalifa is a skyscraper in Dubai, United Arab Emirates, and is currently the tallest manmade structure in the world, at 829.84 m (2,723 ft). skyscraperDubai tallest manmade structure in the world Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010.