Old slate mines were converted into an underground amusement center.

What used to be a slate mine in the 18th and 19th centuries, and then a hiding place for valuable artwork during World War II, is now an underground playground fitted with three giant trampolines. This unique experience is offered by Welsh adventure company Bounce Below, and includes a subterranean train ride, a 60 foot slide, LED lights and a collection of record-breaking trampolines.

On entering the Llechwedd Slate Caverns, visitors are outfitted with overalls and helmets, before being loaded onto an underground train that takes them to the main cavern. From there, they plummet down a 60 foot slide to reach the trampolines, which are suspended at heights of 20-, 60-, and 180-feet. To ensure guests aren't jumping around in the dark, the cavern has been fitted with a multi-colored array of LED lights.

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