Island where motor vehicles are banned -- home to the only carless highway in the United States.

A Beaux-Arts triumph set to become Ford's innovation campus

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

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

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

The eroded core of an ancient volcano is now accessible by a short hike.

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

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

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

A Wild West jailhouse that slid down the mountainside.

What is the Thing?

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

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

Limestone caves with spectacular showcase chambers.

A spiritual vortex among the red rocks in Sedona.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

An homage to everyone's favorite prehistoric cartoon family.

See massive fossils that are over 200 million years old in northeastern Arizona.

A reproduction of earth's many biomes.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An amazing collection of model trains, collectibles, and artifacts that span the last 100 years.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.