This Manchester laundromat is hiding something.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

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

A glacial pothole was once a hideout for a notorious Scottish outlaw.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

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

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Stonehenge has nothing on Castlerigg’s views.

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

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Fantastically decorated underground chambers built in the 1760s.

A remarkably well preserved tower dating all the way back to the Iron Age.

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

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

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.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."