A wonderfully strange collection of 500+ stuffed frogs doing people things.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

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

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

Island wonderland for communist autocrats.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A musical instrument played by the sea.

Colorful concentric circles honor a small Croatian town's supposed spot at the nucleus of it all.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

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.

Trimmed trees grow alongside the graves like topiary tombstones.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

A cemetery for Slovenian notables also serves as a popular recreation space.

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

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A relic from the Industrial Revolution got a second life as a contemporary performing arts space.

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

A whimsical bridge adorned with decorative dragons.

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