When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The oldest continuously occupied public building in the United States.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

A little slice of Florida face-in-a-hole kitsch, unexpectedly located in a small New Mexico town.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

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

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

A group of college students hauled a desk up a mountain more than 40 years ago. The notebooks inside have become a makeshift time capsule.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The state bird of New Mexico, constructed entirely out of garbage.

The lobby of this hotel near the U.S.-Mexico border features a stained-glass mural that measures 42 feet long and 6 feet tall.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

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

A mistaken marker makes an erroneous claim along the historic Old Divide Road.