This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

The Slovenian architect designed many landmarks in the capital city, including his own dream house.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

In between two buildings in Ljubljana, medieval tunnel to nowhere.

A public work of art that also provides some relief from the summer heat.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Strange rumors surround the artist who created these solemn metal guard dogs.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

Watch the local Netherlands birds from inside this giant eco-egg.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.