Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

In the U.K., a historic workhouse shines a light on the early, harsh treatment of the poor.

An open air haven for tropical monkeys in the damp moors of the English country.

On a site with a long military history, a 1980s shelter.

A hundred copies of Antony Gormley's naked body stare out across the water.

19th century tunnels burrowed under Liverpool.