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

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

The graffiti-covered ruins of an abandoned trading post in the middle of Navajo Nation.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

Native Americans built this circle of stones, which was used to predict astronomical events.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The largest outdoor art gallery in the Northwest United States.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

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

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

Colorado's only true geyser is hidden within the San Juan National Forest.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.