A library and shop devoted to the body, mortality, and bringing to light forgotten or neglected histories

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

Macabre astrological automaton clock dating to the late 1400s.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

An eatery for UFO seekers on the Extraterrestrial Highway.

This large round boulder is said to emit spiritual power, but it may just be magnets.

A mysterious air force base built to resemble a Long Island fishing village.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A marvel of Byzantine engineering under the streets of Istanbul.

Cold war icon and onetime "hole" in the iron curtain.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

An underground city of salt.

Four-story concrete hotel never opened to customers.

A room in New York City that contains 250 cubic yards of dirt.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

Trash-filled shrines to an unofficial saint known for her endless breast milk dot the highways of Argentina.

Natural saunas fed by volcanic heat.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Death rituals and sacrifice inside a Peruvian megalith.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.