The first declared National Monument in the United States.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The only theatre in the world constructed specifically for sound movement.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

A hand-built folk art installation covered with messages of God's love.

A kaleidoscopic warehouse-maze of handmade neon signs.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

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

The United States Capitol's former columns still stand.

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

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

The ghostly remains of an accidental sea.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

A bizarre house filled with an astounding array of collections.

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

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

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

On the Oregon coast there is a natural hole that seems to be draining the sea.

Rippling sand dunes frozen in the Arizona rock.

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

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

A deserted hodgepodge of experimental structures designed by nearby university students.