Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

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.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A museum in the childhood house of a medical pioneer.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Once the home of a hermetic monk, this cave now houses a small church.

A whimsical bridge adorned with decorative dragons.

Where the lovelorn find a home for their sentimental keepsakes.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A futuristic, brutalist masterpiece that is also strangely prison-like.

What happens when you cross a mayor and a painter?

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

Gigantic water vessel, permanently grounded in Southern Albania.

Monasteries on rock pillars, once accessible only by frayed ropes.

Where commuters walk through remnants of an ancient Greek necropolis.

The ancient latrines of the Greeks, in all their public glory.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.