A daredevil cyclist has risked his life to tackle the terrifying Arizona White Line mountain trail - thought to be the most daunting in America.
Polish biker Michael Kollbek completed the dangerous almost-vertical track in Sedona that stretches across a rocky cliff face.
According to ITV News, it was captured on drone footage and Kollbek described it as "one of the scariest things I have done on a bike".
He posted a clip of his feat on Instagram, but warned inexperienced riders against tackling the trail.
Riding the white line in Sedona was one of the scariest things i have done on a bike. Thanks to @marshallmullen for 🎥. You can see full length vid from the drone on YT and FB. #sedona #whiteline #arizona #redrock #bike #mtb #notenduro #gopro @gopro
A video posted by Michal Kollbek (@kollbi) on Mar 12, 2015 at 9:01am PDT
The Mirror reports that Kollbek decided to cycle the trail, which is a white stripe of sandstone on the edge of a cliff, after first walking the route and then sleeping on the decision for a couple of days.
Speaking to the Huffington Post, Kollbeck said: "Conquering this ride was all mental. I was confident with my skills and knew I could execute it. The key was to block the out the scary thoughts about the potential danger, so I just focused on the trail and not on the terrifying space around me."
"I live for thrills like this, and I would have tackled this line whether it was filmed or not.
"The drone was a bonus, and [videographer Marshall Mullen] did a great job capturing the moment. However, it's not for everyone, so I strongly advise inexperienced riders against trying this line."
The video has had over a million hits on YouTube, and one user joked: "Don't worry guys, he was perfectly safe, he had his helmet on."