The Willis Tower observation deck, called the Skydeck, opened on June 22, 1974. Located on the 103rd floor of the tower, it is 1,353 feet high.
The all-glass boxes, informally dubbed "The Ledge", allow visitors to look through the glass floor to the street below. The boxes were opened to the public on July 2, 2009.
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Links: en.wikipedia.org
By: kjfitz