Reel Rock: The World’s Hardest Route from Outside Television on Vimeo.

What’s great about this rock climbing video is that you see how two superior climbers keep trying to make it up the rock face. I liked watching them fall off—of course they are attached to ropes—and then attack again or figure out a different route.

Dubbed the hardest sport climb in the world, Spain’s La Dura Dura route has only been conquered by two top climbers, who spent two years attempting the rocks in Oriana. Clocking in with a rating of 5.15c, it’s considered one of the globe’s most strenuous routes. Recently a second climb has surfaced as a contender for the title: one of La Dura Dura’s climbers has proposed Norway’s Flatanger Cave, a soaring cavern with a gorgeous view and gravity defying slopes, for the same rating.