Petroglyphs on Signal Hill Trail in Saguaro National Park

Petroglyphs are the ancient graffiti of the southwestern United States. A great place to see petroglyphs without breaking a sweat is at Saguaro National Park where pictures of spirals, animals, and squiggly lines are etched or scraped into the rocks by the prehistoric Hohokam. It’s unknown whether petroglyphs were religious symbols, directional signals, or …

Sonoran Desert Museum

The site of the Arizona-Sonora Desert Museum in Tucson used to be underwater. When the water and swamps retreated, a rugged landscape was left behind. The caves filled with fossils, dinosaur bones resting in the rocks, and petrified mud still clinging to ancient hillsides make up what we call today the Sonoran Desert. Visiting …