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.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

The largest source of fossilized insects anywhere.

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

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

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

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

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

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

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

This vintage theme park is peak Christmas kitsch—and it's open all summer.

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.

This enigmatic building features numerous architectural styles.

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.

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

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

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

Drift through decades of high desert music history at this funky hometown museum.

The clock that sets them all.

A research lab and hands-on museum where visitors can experiment with retro technology.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.