Don't look down. Even when you're just watching the video.

Caminito del Rey, or "The King's Little Pathway," is a walkway along a gorge in Málaga, Spain. It was originally built in 1905 for construction workers to bring supplies to a hydroelectric dam they were building, but its fame only came years later as it fell into disrepair. The walkway became so dangerous that daredevils from around the world sought it out to test their nerves, as well as their climbing skills. And it was a good test, because a lot of them died.

Sources: | The Telegraph