Living trees form the structure of an open-air palace.

Is this statue at Naumberg Cathedral the fairest of them all?

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

This small train ride offers stellar views of the Grand Garden Palace.

When the rain falls, this drain system turns into a musical instrument.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

The center of this Polish border town was so thoroughly wiped out in World War II that only the foundations remain.

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

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

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

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.

The site of Austria's biggest concentration camp now honors its victims.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Two stunning 17th-century libraries and a cabinet of curiosities.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A giant interactive periodic table with real samples of the elements.

This artificial cave looks like something out of a fairytale.