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World's largest underground trampoline

blaenau ffestiniog underground trampoline llechwedd slate quarry longest zip-wire

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#1    Still Waters

Still Waters

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Posted 24 June 2014 - 10:45 PM

It's already home to the world's longest zip-wire, now Blaenau Ffestiniog boasts what is believed to be the world's largest underground trampoline in the abandoned Llechwedd slate quarry.

http://www.bbc.co.uk...ctures-27994637

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