Rhosydd Slate Quarry - Blaenau Ffestiniog
A 19th-century slate quarry, known for its extensive underground workings and rugged mountain setting.
Foel Grochan - Aberllefenni
Part of the longest continually operated slate mine in the world until its closure in 2003.
Slate Quarry Drainage Level - Wales
Serving as a drainage channel for a popular Welsh quarry.