This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

Where the author wrote her beloved "Little House" books.

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

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

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

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

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.

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

The biggest solar telescope in the world helps reveal the secrets of our sun.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

When ecosystems collide in the arid Southwest.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This popular pilgrimage site offers a hole filled with holy healing dirt.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.