The decaying ruins of Wales' first asylum for the mentally ill.

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

The heads of two giant mythological water horses honor Scotland's horselord past.

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.

A book bound in the skin of an infamous criminal, along with countless other specimens.

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

A modern English garden of eccentric beasts, follies, and oddities.

A subterranean playground in an abandoned slate mine.

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

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

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

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

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

The largest greenhouse in the world is home to over one million types of plants.

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

A unique waterfall that some believe attracts the fairfolk.

400-year-old garden, restored to beauty.

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

Surreal riveted sea forts once protected the Kent shores from German attack.

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

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

The remains of Crystal Palace Great Exhibition of 1851.

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