A museum dedicated to secret surveillance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

Where Venice's gondolas go for a tune-up.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A subterranean house of worship carved right out of the bedrock.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

The charming storybook building now houses a small police museum.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A slice of central Asia in the middle of Berlin.

A replica of the Statue of Liberty watches over the tomb of 72 Chinese revolutionaries.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The world's first invisible city square is an homage to a man who pushed the boundaries of art.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

Romania's triumphal arch looks out over Bucharest.