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

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

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

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

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

This historic national park is covered in the stunning ruins of red rock pueblos.

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

A spiritual vortex among the red rocks in Sedona.

A reproduction of earth's many biomes.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Take a monster truck tour around an ostrich farm in the middle of the desert.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

This abandoned horse racing track was an exercise in hubris from its inception.

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

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

The first permanent memorial to a unique secret weapon of World War II.

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

These free-roaming horses were once destined to disappear from the land.

A self-built castle made by a mysterious man.

The unusual burial monument of Arizona's first governor.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.