Chicago: The Ledge, a clear glass enclosure protruding from the Willis Tower, lets you walk out and experience Chicago from 103 floors above the city. The Willis Tower is the second-tallest building in the United States at 110 floors and the eighth-tallest freestanding structure in the world. The skyscraper is one of the most popular tourist destinations in Chicago, and over one million people visit its observation deck each year.
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