A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

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

The town of Argleton has a postal code and appears on maps and even real estate listings, yet it does not exist.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

This jewel of an engine is one of Northern England's finest surviving legacies of the Industrial Revolution, even catching the eye of Henry Ford.

This mummified mermaid corpse is an aquatic curio that was eventually revealed to be a fake.

An Anglo-Saxon cross inscribed with possibly the oldest written work of English literature.

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

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

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

A sweet symbol marks the place where torturous executions were once carried out.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A circle stone within a stone circle.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

A popular day's outing in Bovington consists of watching military tank driving practice.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A perilous medieval road leading right into the sea.

A remote gravestone on the moor marks the spot where a teacher's body was found under mysterious circumstances that remain inexplicable.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.