This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

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

This antique prison is a tourist attraction with a sordid past.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This Manchester laundromat is hiding something.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

This small collection of rare books was uniquely locked up for safe keeping.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

The cedar tree in Highgate Cemetery earned its title by accident.

A 550-square-meter micro-nation off the coast of Britain.

The largest known medieval map of the world.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

A 200-year-old collection of oddities and medical paraphernalia.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

Pop culture has helped to keep this iconic British building from being destroyed.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

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

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

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

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.