Held every year in Tuscany since 2003, Hell's Gate is largely responsible for creating the "Hard Enduro" style of racing. In it, participants tackle obstacles like waterfalls, boulders and hills so steep, they can't possibly get their bikes up them without help from the crowds of spectators.
This year's event was won by Graham Jarvis, the most successful racer in the event's 10 year history. This video captures the final obstacle and his victory.
And here's a lap of the special test stage with Lars Enockl. Looks...tricky.