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

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

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

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

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

A pagan tradition of draping trees with rags eerily lives on.

A subterranean playground in an abandoned slate mine.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

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

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

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

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.

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

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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.

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