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

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

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

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

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

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

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

The home of a formerly enslaved man who went on to become a prospector, entrepreneur, and activist for Black rights.

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

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

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

A tiny nondenominational church harkens back to the days of the first homesteaders in the region.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

This restored farmhouse is a time capsule of a 19th-century Colorado homestead.

This massive home was constructed by one of the greatest conservationists in Colorado history.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

This marker identifies the location where three states converge.

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 nearly abandoned town was once a thriving mining community until a series of fires.

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.

A coal fire has been burning underground here since 1896.

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