These warring psychedelic crags commemorate an unsuccessful military operation.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

Museum celebrating the achievements of the Soviet space program.

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

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

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

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

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

Former headquarters of the KGB.

Moscow's imposing monument to the Space Age.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

This German "living museum" is maybe a bit too immersive.

An eerie, derelict amusement park in Berlin.

Yugoslavia's biggest underground airport lies in ruins.

340-foot statue built to honour the Heroes of the Soviet Union.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chernobyl disaster.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

Retirement home for giant obsolete machines.

Berlin's old airport.

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

When German-Iraqi relations broke down, this embassy was vacated post haste.

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