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

A museum dedicated to the mysterious cryptid.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

A museum of natural history, Edwin Carter's original log cabin home and workshop houses taxidermy specimens.

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

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

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

A prehistoric rock shelter that's literally in someone's backyard.

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

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.