These mid-century motels once housed the workers who built the Glen Canyon Dam.

The oldest continuously occupied public building in the United States.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

This industrial Art Nouveau gem is a historic hotspot for Mexican counterculture.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A self-built castle made by a mysterious man.

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.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

This collection of vintage signs reflects the long and colorful history of this Arizona town.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

What is the Thing?

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

Limestone caves with spectacular showcase chambers.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

Hidden on a cattle ranch in Arizona, this bookstore has been celebrating Southwest literature for more than 40 years.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

A reproduction of earth's many biomes.

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

This church on a Tohono O'Odham reservation has stood since 1797.