Half of a waterfall goes into the river while the other half seems to disappear.

An eclectic collection of artifacts from the Wild West is preserved in a remote fictional pioneer town.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

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.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

One of the American Southwest's most extensive collections of Navajo rock art.

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

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

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

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

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Legends surround this jagged rock formation in the New Mexico desert.

This Italian foot path winds through the mountains via 52 individual tunnels.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.