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The first trampoline you'll go on (3rd level up) - Picture of Zip World Slate Caverns, Blaenau Ffestiniog - Tripadvisor
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This is Not a Computer-Generated Theme Park, Just the World's Largest Underground Trampoline – TechEBlog
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Blaenau Ffestiniog: Giant underground trampolines tipped as next big tourist attraction - North Wales Live
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