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

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

Unlike most arches, this geological oddity formed in a volcanic dike.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.