Nik Wallenda

Daredevil Nik Wallenda is preparing to walk across the Grand Canyon on a tightrope with no safety harness.

Nik Wallenda, a member of the famed "Flying Wallendas" family of aerialists, has completed an historic tightrope walk over Niagara Falls.

Stuntman Nik Wallenda will challenge himself once again by walking across the Niagara Falls on a two-inch-diameter cable, unharnessed.