The largest catacomb system in the world.

Europe's highest peak is a key pillar of the Seven Summits mountaineering challenge.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

Two islands just 4 km apart separated by an International Border and Date Line.

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

The giant Siberian crater known locally as the "doorway to the underworld" is expanding every year.

This remote lake in Siberia supposedly contains a fearsome sea monster.

Siberian whale bones stand as cairns marking location of an ancient butcher yard.

The world's tallest statue of a woman wields the world's tallest sword and is at risk of toppling over.

Gigantic natural towers in a Russian plateau.

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

A homemade anatomical collection of medical anomalies and accidental catastrophes.

Replica of mosque destroyed by Russia in the 16th century.

A city block packed with whimsical sculptures that seem to be plucked from a tiled fantasy world.

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

Unusual, mushroom-like rock formations caused by weathering and water erosion, set to disappear, according to geologists.

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

Former prison camp dedicated to the victims of political repression.

The world's first museum dedicated to the work of game-changing naturalist Charles Darwin.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

The coldest city in the world.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

Some of the world's only freshwater seals live in one very special lake in Russia.