In reply to mark s:
Try this for a more adventurous way to explore the Dinorwic Quarries...
Hobbits, Ladders and Tunnels (XS)
It's not been repeated yet as far as I know.
Quite a few slate quarries in North Wales, a really cool one on Anglesey near point Lynas. Plenty more scattered around Snowdonia Rhyd Ddu, Fron, Nantlle, Talysarn, Penrhyn Quarry etc
Further afield the Lake District quarries are also cool though obviously not as cool as our Welsh ones
