James Smart Lonely Planet

If you've ever wanted to practise trampoline tricks in a slate mine (and who hasn't?), then 'Bounce Below' – a 'cathedral-sized' cavern with bouncy nets, walkways, tunnels and slides – is your chance (adult/child one hour £25/20). There's also 'Titan' – 800m of zip wires over deep open pits (£50 per two hours) – and zip wires through the caverns (£65 for two hours).