A marvel of Byzantine engineering under the streets of Istanbul.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A layered tribute to the work of mosaicist Isaiah Zagar.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A snapshot of the city's fascinating voodoo culture.

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

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

Budapest's Communist-era statues, banished to the suburbs.

Once the home of a hermetic monk, this cave now houses a small church.

A semi-scholarly approach to sex.

A terrific purveyor of natural history objects and curios.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Where the lovelorn find a home for their sentimental keepsakes.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Come for the flowers, stay for the bats!

This historic observatory contains the world's oldest refracting lens telescope.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

Two stunning 17th-century libraries and a cabinet of curiosities.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Where commuters walk through remnants of an ancient Greek necropolis.