The owners of the Sears Tower , the tallest skyscraper in the United States ( Chicago ), inaugurated last week four glass box viewing platforms. These balconies are suspended 1,353 feet ( 412 meters ) in the air on the 103rd floor. They are 10ft high and 10ft wide and can hold 5 tons with their 1.5 inch thick glasses.
Really impressive and definitively something to try...

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