Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Naturally formed rock city in Poland.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Enormous sandstone towers loom within a Czech forest.

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

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

A plaque marks the former home of Käthe Paulus, an aerial acrobat who invented the modern folding parachute.

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

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Before he was forced to flee the country under Nazi rule, Albert Einstein spent his summers in this custom-built lakeside house near Berlin.

In a divided Germany, Potsdam's "central" train station was relocated to the city's southern suburbs to avoid West Berlin.

A quaint Russian village in the middle of a German metropolis.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

The "Prussian Versailles" that is as glorious today as when it was built.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.