This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

There are hundreds of secret WWII bases hidden in British forests. Built to fight a Nazi invasion, they remained unknown for decades.

A ruined castle has more than its fair share of legends and ghost stories.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

Beasts and branches swirl in sandstone carvings, interrupted by one strange creature.

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

The largest known medieval map of the world.

This antique prison is a tourist attraction with a sordid past.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

A house of bones — but nobody is quite sure to whom they belong.

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

Museum about life, death, and cannibalism in the Stone Age.

The sign at the garden gate reads: "These Plants Can Kill."

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.