This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

Modern megaliths form this work of cosmic, Celtic landscape art.

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

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

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A circle stone within a stone circle.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

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

This Scottish burial tomb once held hundreds of ancient eagle bones.

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

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

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

Grab a cuppa at England's first and only domestic tea plantation.

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

This modern labyrinth lies in the shadow of a ruined medieval castle.

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

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

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.