The fifth-longest natural arch in the world, and the longest outside China.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

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

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

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

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

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

This enigmatic building features numerous architectural styles.

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.

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

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

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

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

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

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

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

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

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

European castle ruins in an American state park are actually the product of death and grief.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.