The developers and artists at Zwift have created a new route, Alpe de Zwift. They imported GPS data from Alpe d’Huez. Their ride starts at sea level in the jungle of Watopia, but quickly climbs up above the snow line. The scenery may not match the real thing, but the road has the same 21 switchbacks and the same profile.
You have to be a Level 12 Zwifter to ride it, unless you join a group ride that’s going.