This naturally-sourced hot spring is now home to a clothing-optional resort.

A hip bar decorated with walls of golden skulls.

Take a drunken tour inside the world's largest known geode.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Towering basalt columns, a creation of fire and ice.

A 30-acre garden inspired by the principles of modern physics.

A museum befitting the city responsible for supplying the majority of the world's LSD.

The first declared National Monument in the United States.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The sign at the garden gate reads: "These Plants Can Kill."

Enormous lake at the bottom of a unique cave system.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An emerald-green grotto just a short trip from Austin.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This living labyrinth made entirely of thorns is filled with art.

This replica of the Indian spiritual master Meher Baba's tomb stands unfinished in the New Mexico desert.

A train ride to the middle of nowhere gives its passengers some of the most iconic views of Japan's seasons.