A fortified city, home to a remaining population of five families

Mosaics, storks, and brothels—this ancient city has it all.

One of the most spectacular canyons in the world.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

A marvel of Byzantine engineering under the streets of Istanbul.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

An Art Nouveau building covered in animal gargoyles and grotesques.

This attraction was abandoned after the Chernobyl disaster.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A spiritual vortex among the red rocks in Sedona.

Most-visited and most-photographed slot canyon in the American Southwest.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

A museum dedicated to exhibiting remarkable outsider art.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.