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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Rippling sand dunes frozen in the Arizona rock.

This now-abandoned outcrop is an important Native American spiritual site, overtaken by European settlers and mining pollution.

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

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

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

A coal fire has been burning underground here since 1896.

Toss a Frisbee through the ruins of this Colorado gold mining town.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

A river runs through this remote valley in a very unexpected way.

Open-air cremations in Colorado's self-proclaimed spiritual mecca.

Unlike most arches, this geological oddity formed in a volcanic dike.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

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

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

A mental health hospital dating back more than 139 years, now features a museum.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.