Niagara Falls Tightrope Act

June 15, 2012: In 25 minutes "The King of the Wire" Nik Wallenda walked over Niagara Falls on a two-inch-thick wire from the U.S. to Canada. The 33-year-old daredevil is a six-time Guinness World Record holder from Florida and comes from a family of acrobats. For his next stunt, he hopes to cross the Grand Canyon on a wire.

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