Love caves? Love trampolines? Now you can combine the two in one riveting experience. Adventure company Bounce Below installed three giant trampolines inside the sprawling belly of Llechwedd Slate Caverns for visitors to bounce on. The trampolines are safely suspended from the cave walls and ceilings, and a host of vibrant LED lights illuminate the subterranean playground.

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The trampoline experience at Bounce Below is really like no other. Visitors are given special jumping safety gear, including overalls and helmets, before they hop on a train that takes them deep inside the mountain. Once inside, the adventure begins with a 60 foot slide that leads right to one of the three trampolines.

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Each trampoline is suspended above the massive cavern at 20 foot, 60 foot and 180 foot levels. Guests can bounce inside the safety-netted walls while admiring the cavern’s rubble and rocks below. To get from one trampoline to the next, guests simply have to jump on a chute that connects them. The experience is heightened with varying colors of LED lights that make the nets glow.

The caverns were originally created to mine slate in the 18th and 19th Centuries, and were later used to hide precious art works from the Germans during World War II.

Zip World, the creators of the trampolines, wanted to fuse an exploration experience with the fun of a playground, regenerating the long-unused cavern. The fun begins on July 3, 2014, when the thoroughly tested trampolines open to the public.

+ Bounce Below

Via My Modern Met