A self-funded cemetery with a long list of inhabitants.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

A little known Colombian theme park of giant curiosities.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Cuba's historical trains remind natives of their country's sugary sweet past.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

70 years of foreign military influence on the shores of Tripoli, Libya.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The mysterious round rocks of Schooner Gulch.

Canyon walls shrouded in ferns.

The hallucinogenic center of the ancient world.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

A modern day curiosity cabinet.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

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