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

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.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The largest source of fossilized insects anywhere.

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

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

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

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

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

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.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

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

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.

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

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

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