The remnants of the base where US Army troops learned how to fight in extreme conditions.

This interpretive path lets you get up close and personal with dinosaur bones.

A unique arch graces the Dolores River Canyon near the Hanging Flume.

A remote sandstone plateau named for a legendary cattle rustler.

A coal fire has been burning underground here since 1896.

A natural formation that resembles a camel resting in the New Mexico desert.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The decaying ruins of a failed mining company’s water diversion project cling to the side of a desert canyon.

Two creeks flow out of either end of this canyon in opposite directions.

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

This spectacular track has run continuously since 1882.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Home to a timed geyser created by complete accident.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

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

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

Possibly the world's only drive-in movie theater with an attached motel.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

A technicolor place of worship for Elevationists.

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

16,500-acre ranch filled with American heritage, geological wonders, and a giant pile of tires is the crown jewel of an intriguing tug-of-war.

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

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