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PHOTOS: Nik Wallenda Trains for Niagara Falls High Wire Walk

Nik Wallenda is preparing for his unprecedented high wire walk across Niagara Falls this Friday. The seventh-generation daredevil will walk approximately 1,500 feet on a tightrope wire, just 2 inches in diameter, that’s suspended nearly 200 feet above the raging waters. See what goes into the training process as he attempts his greatest stunt yet and watch Nik Wallenda's unbelievable attempt on "Megastunts" Fri., June 15, 8/7c on ABC.