A labyrinthine underworld of tunnels and caverns hides beneath the city.

A curious urban windmill once owned by a renowned British mathematical physicist.

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

The Birthplace of the Englishman who founded the A.C. Milan football club.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

What was once England's second-richest abbey is now a haunting ruin.

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This abandoned lock-up was saved because of its connection to a local football team.

The abandoned railway bridge stands hidden in the farmland of rural Cumbria.

A relic of Victorian grandeur hides beneath a busy South London road.