An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A submerged village appears when dam levels drop.

Perhaps the most spectacular grotto along the Algarve coastline.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

This small chapel is built of human bones and decorated with a golden skeleton.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Houses are tucked between, on, and underneath giant boulders.

This Slovenian museum houses the country's largest collection of painted beehive panels.

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.

On a small Slovenian island, diners can mix and match a classic cake into dozens of sweet and savory flavor combinations.

This small Slovenian town has become a magnet for microbreweries.

A beautiful drive through the foot of the Alps traces the path of 15th-century Turkish raids.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

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

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

A whimsical bridge adorned with decorative dragons.

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.