A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

The abstract sandstone rock formations at this Algerian national park are rich with prehistoric art.

An existential riddle in the world's largest ancient castle.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

The smallest country in the world.

The wild west is still alive and well at this authentic mining town watering hole.

Water of undetermined depth has attracted rare fish and cult leaders alike.

There's nothing creepier than a cemetery next to a clown motel.

An eatery for UFO seekers on the Extraterrestrial Highway.

Eulogizing an unknown man's unusual demise.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

A new kind of theme park for adults off the Las Vegas Strip.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

The drama of nature in full effect in this Nevada State Park.

A picture-perfect town, perfect for blowing up.

This former lieutenant governor's home is brimming with curiosities.

Odd outsider art installations surround a Gold Rush-era ghost town.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

This sanguine boulevard was named after a deadly cowboy bar fight.