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

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

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

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

One of few remaining antique carousels with stationary animals in the U.S.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

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

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.

The remains of an early 1900s dude ranch that operated until the 1970s.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

This marker identifies the location where three states converge.

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

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.

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

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.

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

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

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

A home covered with elaborate mosaic and other pieces of art.

An eclectic collection of artifacts from the Wild West is preserved in a remote fictional pioneer town.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.