Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

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

A national collection of Communist-era musical posters.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A hidden art gallery in an abandoned Warsaw fort.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

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

Eastern Bloc nostalgia, anybody?

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This hidden collection of everyday objects illustrates life within communist Poland.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Described as one of the Baltic region’s most daring and original construction projects.

The first museum dedicated to exploring humanity's cultural relationship with the celestial world.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

Open-air museum with a large collection of Soviet-era statues.

An abandoned masterpiece of Soviet Brutalist architecture.

Ever-growing collection of devils in art.

A memorial to the murdered Jews of Kaunas.