"World machine" built by an untrained Austrian farmer.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The resting place for anonymous victims of the Danube's dark waters.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

This Russian diner is staffed entirely by twins.

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

Russian spa's bronze monument to enemas.

These tiny cabins on a cableway have been carrying visitors at a Baltic resort down to the beach since 1912.

Fascinating early attempt at a Jewish autonomous settlement.

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

An unusual collection of self-made musical instruments and unique noises.

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

Stalin's secret bunker.

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

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

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

This Russian museum stresses the importance of keeping clean and even holds one of Pavlov's dogs.

Specimens collected by the author of "Lolita" and self-taught lepidopterist are exhibited in his childhood home.

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

Former prison camp dedicated to the victims of political repression.

Museum design and public transportation meet in this unique Russian train car.

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