This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

The abandoned fishing village was swept right into the sea.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

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

A repurposed railway tunnel with otherworldly acoustic characteristics.

Abandoned for over 20 years, this Art Deco seaside swimming pool is a magnificent waste.

These ancient ruins were the final resting place of King Henry II's mistress.

A series of idealized caves carved to entertain guests.

The ruins of a 19th-century corn mill are haunted by a malevolent cave-dwelling spirit.

Once a training ground for Olympic athletes, this artificial ski slope has fallen into ruin after a fire in 2012.