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The first trampoline you'll go on (3rd level up) - Picture of Zip World Slate Caverns, Blaenau Ffestiniog - Tripadvisor
We test the world's largest underground trampoline... in a north Wales slate cavern | ITV News Wales
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Trampolining inside a secret CAVE: North Wales WOWS the world stage | Travel News | Travel | Express.co.uk
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