Highest Glass Floor of the World in Chicago USAIf 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.
Fearless: Anna Kane, five, spreads out on the floor of the 10ft square box which is 1,353ft up
Spectacular:...