Reference 1738 130 miles (209km) from London
More pictures... Lead mine, Derbyshire, dating from 1830's, including mine buildings, iron tracks, underground passages, tools and artefacts.

Reference 31815 28 miles (45km) from London
More pictures... Disused gravel pit and quarry, Berkshire.

Reference 31110 Central London
More pictures... Underground car park, central London.

Reference 48750 109 miles (175km) from London
More pictures... Canal tunnel with a series of limestone caverns and canal basins including a well area and air shafts. West Midlands.

Reference 882 30 miles (48km) from London
More pictures... Complex of underground passages, Buckinghamshire.

Reference 48264 20 miles (32km) from London
More pictures... A relic of the Cold War: an underground nuclear bunker complete with control room, communications rooms, hospital, offices, telephone room, engine room and extensive outside areas including barns and trenches. Essex.

Reference 48902 South east London
More pictures... Decommissioned cold war nuclear bunker, south east London. Currently used mainly as a paintball centre.

Reference 6781 11 miles (18km) from London
More pictures... Cave complex in Kent.

Reference 49294 Central London
More pictures... Vaulted night-club, central London. (updated images 2012)

Reference 37659 Central London
More pictures... Preserved London underground station - no longer in use - with original stairs, passageways and platforms, and a (moveable) period train.