The remains of slate mines near to the Tranearth site in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Cnicht from Croesor Disused Slate Mine, Cwm Croesor, Snowdonia National Park, Eryri, North Wales, UK

A hiker walks through the abandoned Croesor Slate Mines, Croesor, Gwynedd, Snowdonia National Park, Wales, United Kingdom, Europe

Penrhyn quarry, the largest slate quarry in Wales, Bethesda, Snowdonia, North Wales, Wales, United Kingdom, Europe

Rydal Cave, an old slate mine near Ambleside in the Lake District, Cumbria, England, United Kingdom, Europe

Slate quarries in Elterwater in the Langdale Valley, Lake District, Cumbria, England, United Kingdom, Europe

No entry, danger signs at the entrance to Honister Slate Mine, Lake District, Cumbria, England, United Kingdom, Europe

Slate quarries in Elterwater in the Langdale Valley, Lake District, Cumbria, England, United Kingdom, Europe

Aerial picture, Gelsenkirchen-Sued refuse dump, Himmelstreppe, stairs, Rheinelbe dump, International building exhibition Emscherpark 1999, by the artist Herman Prigann, Wattenscheid, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe