The largest catacomb system in the world.

This attraction was abandoned after the Chernobyl disaster.

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

Fascinating early attempt at a Jewish autonomous settlement.

Social outcasts and cannibalism in Stalin's Soviet Union.

An unusual abandoned church damaged in World War II sits in a small village outside Moscow.

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

Site of the world's largest nuclear explosion.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

Monastery complex at the location where bodies of the executed Romanov royal family were discovered.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

This small museum is basically a time capsule of daily life in the Soviet Union.

For lovers of Soviet cinema, this museum is home to a vast collection of artifacts and costumes.

A monument to Malchik, a stray dog who lived in a Moscow metro station until his tragic death.

This massive monument honors the first human in space.

Gargantuan home of Russian science.

Former estate of Lenin, now home to his death mask.

A 360 degree battlefield experience.

Stalinist skyscraper built with help of cryotechnology.

Home of the future Emperors of Russia.

Church built on the site where the last tsar of Russia and his family were killed.

This cuddly rodent has a place of honor at a Russian institute for genetic research.

No one knows why ancient labyrinths were built on this tiny northern island.