The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Outsider Art Community.

A colorful, century-old cemetery of the Yaqui Indian Tribe hidden amid the suburban sprawl of Tempe, Arizona.

This collection of vintage signs reflects the long and colorful history of this Arizona town.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

Make a wish at what might be America's only Catholic shrine to a sinner.

This scrap yard doubles as a naive art gallery full of found art and farm animals.

An off-the-beaten path cave with an underground lake.

Some of Arizona's best spit-roasted tacos al pastor can be found at a weekend swap meet.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

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

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

Collection of vintage trailers double as hotel rooms.

Limestone caves with spectacular showcase chambers.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

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

Rippling sand dunes frozen in the Arizona rock.

One of Los Angeles's first murals once vibrantly depicted the dangers of United States imperialism.