Walk the ledge of the Willis Tower

The Willis Tower, located in Chicago, was the tallest building in the world for 25 years and is still one of the tallest buildings in the United States.

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Ranked #33 in Man Made Wonders (USA)

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Willis Tower

Willis Tower, formerly named Sears Tower, is a 108-story, 1451-foot (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1974, it was the tallest building in the world, surpassing the World Trade Center towers in New York, and it held this rank for nearly 25 years. The 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.

This description uses material from the Wikipedia article on Willis Tower and is licensed under the Creative Commons Attribution-ShareAlike License (view authors).