June 4, 2013
Nik Wallenda looks at the area over the Little Colorado River in the Grand Canyon. Wallenda will tightrope walk over the canyon June 23. Photo/Jason Elias/Discovery Channel.
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On June 23, Nik Wallenda, also known as the "King of the High Wire," will walk on a tight rope across the Grand Canyon's Little Colorado River, his highest walk ever.