This naturally-sourced hot spring is now home to a clothing-optional resort.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

Curios, scientific antiques, oddities for sale.

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

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

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

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

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

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

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

Open-air cremations in Colorado's self-proclaimed spiritual mecca.

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.

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

A mental health hospital dating back more than 139 years, now features a museum.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

There are eight natural springs around town, each with a slightly different taste.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

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

A fake mine that was made using real mining techniques which is also used as a community center.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.