4 of 16: Daredevil Nik Wallenda crosses a tightrope 1,500 feet above the Little Colorado River Gorge, Ariz., on Sunday, June 23, 2013, on the Navajo Nation outside the boundaries of Grand Canyon National Park. Wallenda completed the tightrope walk that took him a quarter mile over the gorge in just more than 22 minutes. (AP Photo/ Rick Bowmer)

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