5 / 21
Nik Wallenda walks over Niagara Falls on a tightrope in Niagara Falls, Ontario, on Friday, June 15, 2012. Wallenda has finished his attempt to become the first person to walk on a tightrope 1,800 feet across the mist-fogged brink of roaring Niagara Falls. The seventh-generation member of the famed Flying Wallendas had long dreamed of pulling off the stunt, never before attempted. (AP Photo/The Canadian Press, Frank Gunn)

Daredevil's impressive canyon tightrope walk

Florida aerialist Nik Wallenda's successful tightrope walk took him a quarter mile over the Little Colorado River Gorge in northeastern Arizona on Sunday, near the Grand Canyon. He performed the stunt on a 2-inch-thick steel cable, 1,500 feet above a river, with no harness. The walk took just more than 22 minutes.