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13.03.2012
skyscraper Sears Tower (Willis Tower, 110 floors, height - 443 m 2), located in Chicago, the tallest building in the United States and the fifth tallest in the world. At the 103rd floor of the skyscraper were firmly established four glass balconies. Each balcony is able to withstand the load weighing 5 tons, glass thickness is 4 centimeters. A site visit is paid - $ 15.
Source: mirfactov.com/