If you suffer from vertigo or a fear of heights, I suggest not watching the video embedded above.
Seriously. Don't do it.
The footage is of American rock climber Alex Honnold scaling El Sendero Luminoso in Mexico. Not content with simply climbing the 1,500-foot wall by himself -- because, you know, that wouldn't be impressive -- Honnold decided to take on the challenge sans safety gear.
The end of the video promises more footage will be released later. Goodie. More nightmares for me! [H/t: Mirror]