| Coal mining was once the main industry of the Rhondda Valley in Great Britain. The Big Pit ("Pwll Mawr") coal mine ceased production in 1980 but its buildings and machinery were preserved and converted into a museum of mining. Visitors descend into the mine via the 90-m (300-ft) lift shaft to walk through underground roadways, air doors, stables (for pit ponies), and engine houses constructed by past generations of miners. |