World's tallest cigar-shaped radio tower.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

Budapest's Communist-era statues, banished to the suburbs.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Museum dedicated to the terror regimes of Hungary.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The abandoned military base looks like a post-apocalyptic wasteland.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

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

Looming communist pillar with a Czech twist.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

A beautiful but deteriorating monument of Soviet architecture.

The second largest in the world, this massive underground void has its own subway.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

This extensive collection covers thousands of years of Polish military history.

Warsaw's fantastically preserved gasworks...almost.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of downtown Berlin's last reminders of its Communist past.

A fascinating insight into daily life in the Eastern Bloc.

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

A restaurant and observation deck built in a unique broadcasting antenna.