A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This Scottish bridge seems to compel dogs to leap to their death.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

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

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

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

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

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

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

Abstract dinosaur models in London.

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

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

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

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

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

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

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

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

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

A unique waterfall that some believe attracts the fairfolk.

Spend the night in this formerly abandoned traditional Scottish village.