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A black skyscraper with 2 tall antennas: the Willis Tower defines the Chicago skyline like no other building. This structure has 110 floors and stands an impressive 1,450 feet high. The view from the Skydeck is phenomenal. On a clear day you can see as far as 4 different states.
When the tower was inaugurated in 1973, it was the tallest building in the world. It was initially known as the Sears Tower and thus named after the company that built it: Sears Roebuck and Company. Even when the company moved out in the late 1980s, the tower was still known as the Sears Tower. In 2009 however, the tower was renamed the Willis Tower, due to a lease agreement with the Willis Group Holdings.