This happened on 15 November 2015.
Theo Sanson walked more than a quarter mile from The Rectory to Castletown Tower in Castle Valley, Utah.
On a slack line.
But what else is there to do in Castle Valley, Utah … oh wait, Moab is just 16 miles away on State Route 128 where there is world class mountain biking.
The Salt Lake Tribune had the following to say:
Slacklining can be tricky business between two trees; imagine trying to bridge the distance between two high rock towers in Castle Valley.
Théo Sanson, a professional slackliner from France, did just that last Sunday. Sanson crossed the roughly 1,640 feet between The Rectory mesa to the sandstone Castleton Tower, according to Camp 4 Collective, the Salt Lake City-based production company that shot the Frenchman’s feat.
“We climbed the towers with our own gears,” Sanson said. The crew also used three bolts on each side of the line, the same as climbers do for belays, he added. If one of the lines broke, Sanson had a second underneath him.