A self-proclaimed libertarian micro-state on a tiny bit of disputed territory between Serbia and Croatia.

This natural spa is known for its healing properties and vibrant hue.

This dazzling Art Nouveau mansion is now home to the Modern Art Gallery Subotica.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

A Roman monument to their own civil engineering prowess.

Stone age urban planning.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A misnamed well, with a deep dark past.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

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

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

A whimsical bridge adorned with decorative dragons.

Island wonderland for communist autocrats.

Baroque celebration of the end of the Great Plague of Vienna.

If there is one thing you don't want to be in Sweden during Christmas, it's a Yule Goat.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Only spot in the world where an HVDC powerline, a single phase AC and a three phase AC powerline all meet.

The first overseas server for Facebook in Sweden's tundra.

A taxidermied stork with an arrow through its neck proved that birds migrate.