Cathedral Quarries, a set of disused inter-linked quarries for green slate, is above the valley in Atkinson Coppice. The quarry site is now managed by the National Trust and can be entered by the public. It features various chambers and tunnels, including one which is 400 feet (120 m) long. The quarry's main attraction, 'The Cathedral', is a 40-foot (12 m) high main chamber lit by two windows with a huge rock pillar supporting the roof. Some of the quarry smaller chambers are closed off for safety or have already collapsed. The quarry features at least 25 named rock climbing routes that are graded Extreme and are 30–40 m long. The spoil heaps from these mines form large banks where silver birch and larch now grow.
