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

The highest bridge in America was built for an almost unnervingly small amount of money.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The remnants of a 1970 plane crash remain high in the Rocky Mountains.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

This super steep hike ascends 2,000 feet in less than a mile.

This enigmatic building features numerous architectural styles.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

An annual festival celebrating Colorado's most famous frozen corpse.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

This Colorado fire station has been in continuous operation for more than a century.

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

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

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

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

A memorial dedicated to the victims of the Columbine High School shootings.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A technicolor place of worship for Elevationists.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

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

After being lost for nearly a century, this historic bell finally returned home after its mysterious theft.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.