Gilfach Ddu, Llanberis

Gilfach Ddu are a series of well preserved Grade I listed industrial buildings built to serve the Dinorwic slate quarry near the Llanberis in Caernarfonshire, North Wales. The workshops are a complex of repair and maintenance buildings, that were built in 1870 to build and maintain the machinery used in the quarry. The complex includes saw sheds, patternmaking shops, a foundry with copula, blacksmiths shops, fitting shops, stores, engine sheds, a canteen, the chief engineers house, a hand operated crane and two waterwheels which provided the site with its power. Since 1972 the buildings have housed the National Slate Museum. ()