Skier Cody Townsend won Powder Magazine's 2014 "Best Ski Line" award for this run down a steep, narrow crevice in Alaska's remote Tordrillos Mountain Range.
He did it for his film Days Of My Youth, and it's incredible. It's like skiing down a sheer-faced hallway.
Here's the chute:
From above:
From his point of view, you can see how narrow it was:
The full video (via Kottke):