Huge underground trampoline park in a cavern

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Bounce Below is a massive underground trampoline facility inside the Llechwedd Slate Caverns in Wales, UK. There is also a slide. And a zip-line.

Bounce Below is the first facility of its kind, a set of three enormous nets within the Llechwedd caverns in Wales — bringing trampolines to whole new terrain...literally. Bounce Below is an underground playground for both adults and children, set deep inside an old mining cavern that is twice the size of St. Paul's Cathedral.

This activity lasts approximately one-hour and you will be supplied with a cotton overall and safety helmet before jumping on the train and taken inside the mountain. The train will disembark customers into a cavern that is lit up by an incredible display of lights and to a collection of 3 trampolines that have been interconnected by stairways and slides – the biggest of which is a 60 foot slide that just adds to the already awesome experience.

Bounce Below (via BBC News)