The Valley Brook was diverted beneath Queens Park’s lake in 1913 to prevent silting, with a pump system still used today to maintain the lake’s water level.

A small metal mine worked intermittently from around 1700 until it closed in 1903.

A 1.8 mile, 19th century tunnel in Staffordshire that was later abandoned due to safety concerns.

A remote Cold War era military range in northern England, now used for electronic warfare training.

Built in the early 1830s, the Mow Cop tramway tunnel carried horse drawn coal wagons to a canal for local collieries.

A long abandoned Preston railway tunnel, famed for ghost stories, now undergoing a clean up.

This small hospital morgue, decommissioned around 2000, has sat derelict for 25 years.

A former wartime arms store and later a major underground museum.

Broadmoor Hospital, opened in 1863, was, and still is Britain’s most notorious psychiatric institution.