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Old slate mines, on the other hand, are apparently a great site for underground trampolining - https://www.atlasobscura.com/places/llechwedd-caverns-trampo...

Why on earth would you want to trampoline underground?

Blaenau Ffestiniog

Ahh. It's always raining up top. Makes perfect sense. :)

Never rains in Blaenau!!!

Liquid sunshine butt.