A Wild West jailhouse that slid down the mountainside.

A spiritual vortex among the red rocks in Sedona.

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

An urban laboratory.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A geological mystery on Camelback Mountain.

The unusual burial monument of Arizona's first governor.

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.

What is the Thing?

Limestone caves with spectacular showcase chambers.

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.

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

One of the largest open-pit copper mining operations in the entire country.

The world's largest military aircraft cemetery.

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

A natural history wunderkammer in the middle of the desert.

Miniature art that tells an enormous story.

A rare wayfinding portmanteau of “Street” and “Avenue.”

A cabinet of curious mathematical models and old calculators.

In Tucson a giant metal snake helps pedestrians cross a busy highway.