Moscow's imposing monument to the Space Age.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Immortal combat in a Moscow museum.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Relics from an era long gone, sit idle outside this Estonian museum.

Colorful power station with a chimney equipped with a gallery for exhaust monitoring equipment.

This sublime architectural marvel is a rare example of an expressionist church.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A naturally beautiful, seemingly bottomless deep blue spring.

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

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Twisted buildings adorn the banks of the Rhine river.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A striking public sculpture representing the period of martial law in Communist Poland.

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

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Bridge that died in war and was resurected.

These warring psychedelic crags commemorate an unsuccessful military operation.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.