This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

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

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

A Tucson museum and performance space full of found-object movable sculptures.

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

The Magical World of George Phar Legler.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

An homage to everyone's favorite prehistoric cartoon family.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Limestone caves with spectacular showcase chambers.

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

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

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

This giant steer-skull edifice refuses to die.

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.

The first steel dam in the world and the only one still functional in the United States.

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

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.