The biggest solar telescope in the world helps reveal the secrets of our sun.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

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

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

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

One of the largest private collections of cars manufactured by the short-lived Franklin Automobile Company.

The Magical World of George Phar Legler.

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

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

An urban laboratory.

Inside this store, a mysterious statue draws visitors from the world over.

Outsider Art Community.

The largest and most well-preserved petroglyph site in the Verde Valley.

Inside this garden, visitors are offered a glimpse into how inhabitants of the region survived centuries ago.

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

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

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

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

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

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

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