03/05/1973 Upon completion, Sears Tower the becomes tallest building of its time
Willis Tower: When It Was Sears
Why Doesn't the Willis Tower Topple Over?
Willis Tower In Chicago Prepares For A $500M Face-Lift
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.