A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A cave's rare beauty held a cavernous secret hidden underground.

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

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A clear blue swimming hole with hidden caves, still unexplored.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

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

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

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

The subtle science of a master molecular gastronomist.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A multimedia experience that chronicles the atrocities of racism.

A shrine to a skeleton saint in the city of angels.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

Rainbow-hued local gem in Venice.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

America's most famous piece of self-built architecture.

10,000 flowered plants bloom in the City of Roses.

Portlandia is the second-largest copper repoussé statue in the United States.

A sculpture of a salmon swimming through a brick building.