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.

Wallenda

Nik Wallenda walks across a tightrope 200 feet above U.S. 41 on January 29, 2013 in Sarasota, Florida. (Photo by Tim Boyles/Getty Images)

Wallenda

Nik Wallenda walks across a tightrope 200 feet above U.S. 41 on January 29, 2013 in Sarasota, Florida. (Photo by Tim Boyles/Getty Images)

A crowd watches as daredevil Nik Wallenda walks a tightrope above the beach at Atlantic City on Thursday, Aug. 9, 2012. Officials say some 150,000 people witnessed the walk. (AP Photo/Geoff Mulvihill)

Nik Wallenda nears the middle of his tightrope walk over Niagara Falls as seen from 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, Aaron Vincent Elkaim)

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)

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)

Nik Wallenda walks a tightrope over Niagara Falls as seen from 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, Nathan Denette)

Nik Wallenda walks across Niagara Falls on a tightrope as seen from Niagara Falls, N.Y., 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/Gary Wiepert)

Nik Wallenda walks across Niagara Falls on a tightrope as seen from Niagara Falls, N.Y., 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/Gary Wiepert)

Nik Wallenda walks over Niagara Falls on a tightrope as seen from 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)

The Maid of the Mist enters near the dangers zone before Nik Wallenda's attempt to walk a 1,800-foot (550-meter) long tightrope over the brink of the Niagara Falls in Niagara Falls, Ont., on Friday, June 15, 2012. (AP Photo/The Canadian Press, Nathan Denette)