Berlin's old airport.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Art and a pun, all in one.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

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

An eerie, derelict amusement park in Berlin.

Where once there was a train station bathroom, there is now this German burger joint.

A visionary precursor to the Internet made of index cards.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

This towering statue of Jesus provided internet to the surrounding area.

The site of one of the largest prison escapes of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This fairytale medieval church in Poland originally spent centuries in Norway.

A World War II torpedo launch station abandoned off the Polish coast.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

On this Polish road, an optical illusion makes cars seem to roll uphill.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

What was once an underground Nazi city is now Europe's largest bat reserve.

This old, abandoned hotel offers magnificent views.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

The highest point in Belgium is a staircase to nowhere.