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.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

An old slave lookout in Cuba's historic sugar cane fields.

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

Stunning Roman aqueduct used for 1900 years and still standing.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Cliffside houses provide a spectacular view from their perch above the valley.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The famous winding walk at Chartres is surrounded in mystery and myth.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This bridge was constructed from the rubble of the infamous Bastille.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The encased skull that is widely believed to belong to St. John the Baptist.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The world's tallest boat lift stands as a massive piece of industrial tourism.

Most prolific publishing house in the 1600s open to the public.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The history and future of cannabis.