A circle stone within a stone circle.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

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

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

Grotto replete with mystical designs laid out in glued shell mosaics.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

Enter the world under the hill at this ancient UK burial chamber.

One family's environment-friendly hobbit-house in Wales.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

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

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

Human-made caves excavated to hide a secret society of wealthy pagans.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

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

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.