From Porthmadog, on the coast, to the "city of slate", the Ffestiniog Railway , built in 1836 to transport slate from the quarry to the port, is today a tourist attraction in the region of Snowdon where the wooded Vale of Ffestiniog , sca..

The story of Welsh slate is told on film. Slate was worked here from 1849 until around 1970 from 250 caverns linked by 40 km of passages. Visitors are carried by train through caverns where tableaux depict the working conditions in the last century.