In the last six years, Nik Wallenda has conducted numerous death-defying tightrope walks, including one across the Niagara Falls, in 2012. But the one he has been dreaming about ever since he can remember, is crossing the mighty Grand Canyon - And while the National Park officials would not grant him permission, on Sunday June 23rd, he came pretty close to achieving it, by walking across the nearby Little Colorado Gorge, that lies on Navajo land.