TEXT: In this photo provided by the Discovery Channel, aerialist Nik Wallenda walks a 2-inch-thick steel cable taking him a quarter mile over the Little Colorado River Gorge, Ariz. on Sunday, June 23, 2013. The daredevil successfully traversed the tightrope strung 1,500 feet above the chasm near the Grand Canyon in just more than 22 minutes, pausing and crouching twice as winds whipped around him and the cable swayed.