This video from late yesterday offers some mind-bogglingly exposed riding on the edge of the Grand Canyon. He’s quite laconic, offering up simply “Vittorio Brumotti ride on the edge at Grand Canyon. Enjoy”
(Can’t see the video? Find it here instead).
If that whets your appetite, why not try it with a little bit of freeclimbing-with-a-bike first?
(Follow this link if you can’t see the embedded video).