The coldest city in the world.

Siberian ghost town built by gulag prisoners.

Stalin's prisoner-built rail line sits in ruin, never having a single car ride its tracks.

Abandoned castle was once a grand example of Russian privilege, built exclusively to win a frivolous bet between noblemen.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

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

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

This nostalgic Russian museum is full of USSR cultural artifacts from the 1970s and 80s.

The tallest hotel in Europe.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

A tiny park off the beaten path covered in ingenious scrap metal sculptures.

Intricate wood carvings on an island in Siberia.

An industrial site turned into Hungary's most cherished natural wonder.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A giant portrait of an ancient king looms over the river.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

"Unity, Creativity, Beauty."

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Welcome to the world's only museum dedicated to the Ukranian Easter egg.