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03/05/1973 Upon completion, Sears Tower the becomes tallest building of its time

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Willis Tower: When It Was Sears

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Why Doesn't the Willis Tower Topple Over?

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Willis Tower In Chicago Prepares For A $500M Face-Lift

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Chicago Sears Tower Skydeck,Breathtaking view from the 103rd floor

The Sears Tower is a 110-story skyscraper in Chicago, Illinois. When completed, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years. The building is considered a seminal achievement for its designer Fazlur Rahman Khan.