This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

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

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

Bridge that died in war and was resurected.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Budapest's Communist-era statues, banished to the suburbs.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A whimsical bridge adorned with decorative dragons.

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

Trimmed trees grow alongside the graves like topiary tombstones.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

This huge metal monument is slowly being stripped to its concrete skeleton.

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

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

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Artists have long been drawn to these atmospheric 12th-century ruins.