Friday, 9 April 2010

Willis Tower

Willis Tower, formerly named Sears Tower, is a 108-story 1,451 feet (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973, it was the tallest building in the world, surpassing the World Trade Center towers in New York. Currently, Willis Tower is the tallest building in the United States and the fifth-tallest freestanding structure in the world as well as the fifth tallest building in the world to the roof.
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