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

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.

All that remains of this once-booming mining town are the ruins of a saloon.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

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

This Nebraska town wants to double its population with plywood cut-outs of townsfolk.

A surprising collection of bronze faces beneath a bridge in Loveland.

After being lost for nearly a century, this historic bell finally returned home after its mysterious theft.

This stone marker honors the man who released Canada goose goslings in Fort Collins, Colorado.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

Within the former ghost town of Cisco is a carefully restored tiny town with one resident and its own art residency.

A house carved into a rock in the 1940s.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

This ghost town was once a cult-like religious utopian settlement.

Oddly shaped rock formation, misassociated with a nearby utopian community.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

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

A hotel with a rich Wild West history of miners and bootleggers.

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

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