One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This house's itty bitty size means no humans allowed.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A temple to modernity, tucked away amid Barcelona's more well known museums.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Bacteria and algae give the salty water its bubblegum hue.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

An architect transformed this abandoned cement factory into his castle-like workshop.

The costumes depict the Kurent, the star character of the annual Kurentovanje festival.

A crumbling World War I fort that is reached through a series of concrete tunnels.

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

This small Slovenian town has become a magnet for microbreweries.

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

The "dragon babies" of southeastern Europe.

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

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

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

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

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

This region of Slovakia boasts some of the most plentiful opal mines in the world.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.