A seemingly endless landscape of pure salt stretches far across Bolivia.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This elegant arc of a waterfall marks a religious turning point.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The most alien-looking place on Earth.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.