The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

At high tide this strange footbridge appears to have no purpose whatsoever.

A subterranean playground in an abandoned slate mine.

A unique waterfall that some believe attracts the fairfolk.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

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

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

A fantastic castle rumored to be the birthplace of King Arthur.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This tangled English forest looks like something right out of a fairytale.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This series of Scottish caves has no clear purpose other than baffling historians.

The atmospheric road was never meant to be so creepy.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.