This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

These fantastically named natural pools look like something out of a Scottish myth.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

Naturally formed rock city in Poland.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

These spooky and unusual stone formations create an underworldly landscape.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Caves famous for the dragon-slaying saint who lived there.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

UNESCO-protected ancient burial ground.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.