This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

An ethereal glowing blue ocean cave in Croatia.

Bridge that died in war and was resurected.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

The fantastic architectural models of a French traveler.

This otherworldly French waterfall looks like its waters have turned to stone.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

These quaint French houses dangle precariously over a precipice.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Series of underground houses inhabited continuously for centuries.

A unique underground structure dating back to the 1st century BC.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

Site of one of World War I's most horrific scenes.

A chapel on a volcanic core, marking the end of a successful journey.

One of the world's most complex timepieces.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

An ancient monastery, a locked room, and a mysterious book heist.