Guests become prisoners on a visit to Latvian prison.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

This Latvian shot factory is still used twice a year to manufacture bullets the old-fashioned way.

You would never guess that before World War II this lonely field was a bustling German city.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Former prison camp dedicated to the victims of political repression.

Museum celebrating the achievements of the Soviet space program.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Moscow's imposing monument to the Space Age.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

A decommissioned Soviet airplane has been used as a movie theater and a cultural center.

This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

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

Man-made mineral caves house massive bat colony.

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