Daredevil Nik Wallenda completes Chicago high-wire acts

More than 500 feet above the ground, dare-devil Nik Wallenda broke two World Records at Chicago's Marina City west tower and Leo Burnett Building. In front of a crowd of 50,000 and a live telecast on the Discovery Channel, he first walked a tightrope between the buildings that started at 588 feet and ended at 671 feet. Originally, the feat was planned at only a 15-degree angle, but regulations from city officials made them change plans at the last minute and make the walk steeper at 19-degree incline.

However, Wallenda wasn't finished yet, when he reached the Leo Burnett Building, he took the elevator and walked back to the west tower of Marina City and did the walk again - this time blindfolded.