Located in France, Alpe d’Huez features year-round skiing high in the Alps. One of the highlights is the Piste du Tunnel, an extremely narrow 300 meter(<.2 mile) ski run that goes through the mountain. Youtuber Ride-Along Sessions with Cookie took a gnarly run through the tunnel, and then took on the 70% pitch that follows it. The video from Cookie is below.
Image/Video Credits: Ride-Along Sessions with Cookie!, Alpe d’Huez