After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

A spiritual vortex among the red rocks in Sedona.

America's only nuclear missile silo open to the public.

This historic national park is covered in the stunning ruins of red rock pueblos.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A sharp bend in a dramatic river canyon cut through red rocks.

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

Colorado’s most beloved glacier is an imposter.

This cliffside memorial marks the final resting place of a lonely violinist.

A once-thriving hotel from the Old West now sits abandoned, under the threat of demolition.

A testament to Colorado’s rugged mining history sits against a backdrop of striking mountain scenery.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

This 28-foot-tall milk can contains one of the most whimsical ice cream parlors in town.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.