This attraction was abandoned after the Chernobyl disaster.

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

This derelict superstructure was a very important warning system for the Soviet military.

The largest collection of death masks in Ukraine.

The deepest metro station in the world.

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

The spectacular Roshen Fountain show lights up the night sky all summer long, until it "hibernates" under the ice waiting for spring to come.

The eerie burnt-out remains of a prominent building where 30 protestors lost their lives.

The largest catacomb system in the world.

Last remaining nuclear missile base in Ukraine.

A monument to Lenin has been transformed into a statue of everyone's favorite black-helmeted, fool-choking Sith Lord.

Glowing orb in Minsk houses 8,600,000 items.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

A decommissioned submarine base makes a great space for graffiti art.

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

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A former imperial sea-fortress and Soviet prison.

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

Two well-hidden huts let animal lovers spend the night among the bears, wolves, and other predators of the forest.

3,000 market stands in five former Zeppelin hangars.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

A historic scientific breakthrough that crosses nine borders.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.