Nik Wallenda is a profressional tightrope walker.  He holds several Guiness World Records and.  Sunday night, he walked across the Grand Canyon on a tightrope with no harness or net.

His rope was 1,500 feet above the gorge floor and and he walked 1,400 feet across the Littler Colorado River Gorge.  It took him 23 minutes.

Wallenda is one of the "Flying Wallendas."  They're a family that has been performing these kinds of stunts for centuries.

The whole thing was on the Discovery Channel, but they put in a 10-second delay.