Probably one of the most inventive uses for the Welsh mines that are no longer mined is Bounce Below. Giant underground trampolines connected by spiral staircases and a 60 foot slide – all illuminated with neon lighting – must make for a fairly atmospheric day out especially when the mining cavern is twice the size of St Paul’s Cathedral. Bounce Below in Blaenau Ffestiniog, Wales opens on the 4th of July.

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