A clear blue swimming hole with hidden caves, still unexplored.

This is one really big nut.

Collection of vintage trailers double as hotel rooms.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Stairs often replace streets on the steep slopes of this old mining town.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

A monument to the forgotten French explorers and their landmark expedition.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Dramatic river bend surrounds a natural red-rocked pedestal.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Legends surround this jagged rock formation in the New Mexico desert.

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

Despite its name, this route in southern Utah offers a heavenly day trip.

The only completed wing of Utah's first capitol is filled with artifacts and odd stories about its past.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

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

This erect, phallic geological spire wasn't always named so domestically.

Miraculous tree that seems to sprout out of solid rock.

Just a man taking his prehistoric pet for a stroll.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.