Don't look down: Terrifying view from glass box balcony jutting out from skyscraper's 103rd floor

"If you're scared of heights, it may be time to look away now.

"Not content with having the tallest building in America, the owners of Sears Tower in Chicago have installed four glass box viewing platforms which stick out of the building 103 floors up.

"The balconies are suspended 1,353 feet in the air and jut out four feet from the building's Skydeck."

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