The vertical-axis windmills of ancient Persia have been grinding flour for 1,000 years and counting.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

The breadfruit-adorned final resting place of the infamous Captain of the HMS Bounty.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

A perfectly running 230-year-old silver automaton and music box.

This former quarry is now a vibrant labyrinth of magical in situ sculptures.

This 15th century pub is one of only two pubs in England situated on consecrated ground.

An optical Illusion once believed to be an electrical phenomenon.

A sea cave with a waterfall and Viking past

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

Each spring this woodland floor is carpeted with purplish flowers as far as the eye can see.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

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

A relic of Victorian grandeur hides beneath a busy South London road.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

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

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

This Manchester laundromat is hiding something.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.