Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

dinorwig quarry slate cavern snowdonia north wales mining history tunnel exploration natural beauty heritage site underground rugged terrain water pools landscape industrial rock formations geology adventure tourism historical travel scenic views architecture nature erosion stone curator excavation darkness light reflection trails ruins cultural significance old machinery abandoned geological features quiet