A naturally beautiful, seemingly bottomless deep blue spring.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

An abandoned resort in North Macedonia is a relic from the Communist Party of Yugoslavia.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Ruins of a German castle on top of a towering stone pillar.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

England's only square-dimension hill horse was built to celebrate Queen Victoria's coronation.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

A miniature village mimics the surrounding buildings so well it includes itself.

This hilarious English intersection is an automotive whirlpool.

Every year locals tumble 650 feet down to the bottom of the hill chasing a Double Gloucester cheese.

It's a mystery as to why this inland village chose the dolphin as its symbol.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.