From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

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

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

A museum dedicated to secret surveillance.

This World War I fortress is the perfect place to catch a Montenegrin sunset.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Deep in the forest next to Augsburg are abandoned bunkers and bullet traps from the region's military past.

An abandoned train station in Munich constructed for the 1972 Olympic games.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The scars of World War II are preserved on its walls.

The patron saint of spinsters grasps a container of dried blood.

A decommissioned submarine base makes a great space for graffiti art.

This unique Renaissance castle was turned into a home for Nazi occultism.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Thirty creepy ghosts now inhabit this decaying 14th-century church.