A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

A monument to the man who almost killed Hitler.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Berlin's old airport.

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

A fascinating insight into daily life in the Eastern Bloc.

Go inside to really appreciate this 500-year-old technological masterpiece.

Erotic art covers the walls of the largest ancient pleasure palace.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

Steadily reminding Czechia of its past.

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

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

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

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

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

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