AmazingUS daredevil Nik Wallenda completes Grand Canyon tightrope walkAFPJune 24, 2013June 24, 2013 by AFPJune 24, 2013June 24, 2013 LITTLE COLORADO RIVER, Arizona: US daredevil Nik Wallenda became the first man to cross a Grand Canyon-area gorge on a tightrope, completing his latest record-breaking...