This attraction was abandoned after the Chernobyl disaster.

Infamous and now demolished panopticon prison built by its former inhabitants.

Abandoned waterpark turned counter-culture mecca.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

Museum dedicated to the terror regimes of Hungary.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

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

This small shrine is dedicated to the designer of the first Russian fighter jet and his brother, who became Chairman of the Presidium of the Supreme Soviet.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

A dormant lightning machine equal to all the power in Russia.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

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

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

These Stalin-era industrial 'death traps' hang lifeless above the city

This soviet pilot's graveyard is filled with headstones made of airplane fins.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.