There are many Petroglyphs throughout the park.

Agua Fria National Monument

Agua Fria National Monument is located in the U.S. state of Arizona, approximately 40 miles (64 km) north of downtown Phoenix, Arizona. Created by Presidential proclamation on January 11, 2000, the 72,344-acre (29,277 ha) monument is managed by the Bureau of Land Management, an agency within the U.S. Department of the Interior. The Bureau of Land Management already managed the lands; however, under monument status the level of protection and preservation of resources within the new monument have been enhanced.

• http://en.wikipedia.org/wiki/Agua Fria National Monument