This potion box on tip of a Willis building lets we mount 1,353 feet above Chicago

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The Ledge is a potion box on a 103rd building of a Willis Tower, a eighth-tallest building in a universe and a tallest building in a Western hemisphere. At an altitude of 1,353 feet we can see adult to 50 miles and 4 states. The Ledge attracts some-more than 1.7 million visitors annually.

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