Willis Tower is a 108-story, 1,451-foot (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, and it held this rank for nearly 25 years.
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Number of sheets:
6"H x 2.25" x 1.57"