Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

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

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

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 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

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

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

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

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

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

It's easy to forget what century it is as you wander this rustic homestead.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

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

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

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

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

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

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

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

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

The world's largest sticker ball weighs in at a mighty 231 pounds.

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.

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