Tuesday, March 18, 2014

The Seven Wonders of the Modern World

People have put together many lists of the seven ancient wonders of the world. But this “seven wonders” list celebrates monumental engineering and construction feats of the 20th century. It was chosen by the American Society of Civil Engineers.

Empire State Building




 Finished in 1931, it towers 1,250 ft over New York City. Until the first tower of the World Trade Center was finished in 1972, it was the world's tallest building. 

Itaipu Dam



Built by Brazil and Paraguay on the Paraná River, the dam is the world's largest hydroelectric power plant. Completed in 1991, it took 16 years to build this series of dams whose length totals 7,744 m. It used 15 times more concrete than the Channel Tunnel.

CN Tower


 In 1976, the tower became the world's tallest freestanding structure. It looms about one-third of a mile high (1,815 ft) above Toronto, Canada. A glass floor on the observation deck lets you look 342 m down to the ground.

Panama Canal 



It took 34 years to create this 50-mile-long canal across the Isthmus of Panama. The amount of digging required and the size of its locks helped make it the most expensive project in American history at that time—and the most deadly: About 80,000 people died during construction (most from disease).

Channel Tunnel



 Known as the Channel, it links France and England. It is 31 mi long, and 23 of those miles are 150 ft beneath the seabed of the English Channel. High-speed trains whiz through its side-by-side tubes.


Golden Gate Bridge 


Connecting San Francisco and Marin County in 1937, for many years this was the longest suspension bridge in world. Experts thought that winds, ocean currents, and fog would make it impossible to build. It took about four years to complete the beautiful 1.2-mile-long bridge. It is held by 80,000 mi worth of steel wire, and the cables that link the two towers are 36.5 inches in diameter—the biggest ever made!

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