The world's tallest climbing wall is 85 meters tall, built on the side of a waste-to-energy plant in Copenhagen, Denmark. 

According to some climbers, it's even scarier than ascending mountains.

Lotte Hansen, a climber, told AFP: "Actually, I have been climbing mountains, but I think this is different because you're climbing on windows. 

"You feel like you're climbing on a building, so I was actually pretty scared last time. I'm hoping it's getting better this time."

The wall was designed to resemble a side of a mountain and has obstacles built in. 

Children are allowed to attempt the climb, but they have to be accompanied by an experienced adult. 

Video editor: Riaz Jugon.