The petroglyphs at Signal Hill are very well preserved and easy to reach.
Saguaro National Park is a great place to get an introduction to the Sonoran Desert.
Perched in the hills outside of Tucson, the park is very accessible.
In addition to saguaro cactus, the fishhook barrel cactus is very common in the park.
Prickly pear cactus and ocotillo are also distinctive plants of the Sonoran Desert.
The petroglyphs are set in a spectacular natural setting.
Some of the petroglyphs are geometric designs.
This petroyglyph appears to depict an animal and a human hunter.
It is estimated that these Hohokam petroglyphs are over 800 years old.