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

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

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

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

The largest self-built castle in the U.S., six decades in the making.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

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

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

The largest source of fossilized insects anywhere.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

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

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

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

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

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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.