A multi-storied adobe complex has been inhabited for more than a thousand years.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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

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

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

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

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

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.

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

This hot dog-shaped diner has moved all around Colorado, never been to New York.

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.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Limestone caves with spectacular showcase chambers.

A reproduction of earth's many biomes.

America's only nuclear missile silo open to the public.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

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

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

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

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

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

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