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This Trampoline Park Is In An Underground Cave, So That's Cool | by Julianne Ishler | OMGFacts | Medium
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World's largest underground trampoline to open in enormous cavern at Welsh slate mine | Daily Mail Online
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Bounce Below, Llechwedd Slate Caverns, Blaenau Ffestiniog, Wales, UK © Clarissa Debenham / Alamy Stock Photo - Alamy
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