Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

A modest stone circle in North Wales.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

This restored 17th century "conduit house," often mistaken for a watchtower, actually supplied water to nearby Bolsover Castle.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Once a farm where patients tilled the soil, this asylum lost its workforce when overmedicating became common practice.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

The remains of centuries of copper mining appear like an alien landscape.

When methane gas started seeping up from the ground, they picked up and moved the entire town.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

An oddly shaped tower built to mark the acquittal of Admiral Keppel in a controversial 1770s case.

The former home of a railway legend and the site of a gigantic labyrinth.

These haunting ruins belong to an ancient village that once had one hell of a view.

A collection of early 19th century trams set in a reconstructed period village.

This poignant WWI memorial looks like a lighthouse 100 miles from the sea.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

The stately remains of Llywelyn the Great's mighty fortress.