A geological mystery on Camelback Mountain.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

A mysterious "wedding cake" castle in the middle of the urban desert.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.

A self-built castle made by a mysterious man.

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

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

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

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

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

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

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

Make a wish at what might be America's only Catholic shrine to a sinner.

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

A cabinet of curious mathematical models and old calculators.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

This collection of neon icons is preserving Arizona's history, one sign at a time.

From working out of his garage to the James Beard semifinals, one Tucson baker has kept his fan base—and his grains—local.

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

This scrap yard doubles as a naive art gallery full of found art and farm animals.

Some of Arizona's best spit-roasted tacos al pastor can be found at a weekend swap meet.

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