Slates from quarries in Wales once went to roof the world. By the late nineteenth century as many as a third of all the roofing slates produced worldwide came f

The Dinorwic Quarry at Llanberis, now the home of the National Slate Museum and the Electric Mountain Visitor Centre, was once one of the largest slate quarries

For thousands of years slate has been quarried in Britain, but in Victorian times it became big business, and the legacy of the industry now shapes the landscap