This is the new Ledge at the Sears Tower in Chicago, which extends 4.3 feet beyond the side of the building. Beneath peoples’ feet lies the sprawling Illinois city - 103 storeys, or 1,353 feet, below. Just an inch-and-a-half of glass separates the visitor from the street underneath. The attraction is due to open in June.
Seriously, click on the picture for a really HQ version. It gives me douchechills and makes me feel a little ill.