Secret North Korean passage discovered below the world's most dangerous border.

This Underground station has been a popular filming location for decades, even before it closed.

Its collection includes a broad array of social, geographic, graphic design, and political history.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A friendly pub with a sordid past in cock fighting.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

Hidden beneath the streets of London is a secret subway that only carried mail.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Museum dedicated to the terror regimes of Hungary.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

An eerie, derelict amusement park in Berlin.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Mountain where Jesus was first tempted by the Devil.