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

Constructed 20 years ago, this sculpture is slowly fading to the hands of time.

The last working windmill in the U.K. that has eight sails.

This unique museum is housed in a rare example of an early 19th century prefabricated cottage.

This century-old cinema is complete with musical interludes and boasts a rare projection system.

This former Victorian bathhouse was all the rage during the mid-19th century and put Woodhall on the map.

This memorial pays homage to the Royal Air Force squadron that breached two important dams during World War II.

This 20-foot mountain is made up of some 15,000 mannequins—if you visit, you can even take a piece home with you.

The half-finished remains of what would have been Scotland’s biggest piece of landscape art.

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

A series of idealized caves carved to entertain guests.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A centuries-old forgotten underworld lies beneath Malta.

The ghost town where the villagers refuse to leave.

This former sewage pumping station is now a fascinating museum.

The oldest candy store in the world has been selling traditional sweets since 1827.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

A fantastic example of Victorian railway engineering with two unusual decorative features.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

At night, the enormous sculpture looks like a UFO hovering above the English hills.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

Inside this chapel, Victorian jailers took the separate system to new levels.

The charming collection illustrates life in Lincolnshire in the 18th through 20th centuries.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.