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

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

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

The ritual has been performed uninterrupted for nearly 700 years.

This crumbling folly looks like an enchanted left over from Middle Earth.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

A remarkably well preserved tower dating all the way back to the Iron Age.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

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

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

This haunting stone chasm is a hotbed of mossy rock and English legend.

A open air theatre built on a cliff by an eccentric British woman.

A curious collection of mechanical moving figures.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

This enchanting hill is home to fairy lore and a sinister local mystery.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Hidden in a Scotland museum is a copse of extinct tree stumps.