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

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

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

Legend says train robbers stashed their gold within the depths of this unusual cave.

The world's largest military aircraft cemetery.

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.

An off-the-beaten path cave with an underground lake.

A reproduction of earth's many biomes.

Miniature art that tells an enormous story.

Religious statues built because of one man's bargain with God fill this peaceful sculpture garden.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

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

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

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

The fading, forgotten remains of a once bright and booming factory.

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

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

A natural history wunderkammer in the middle of the desert.