In 2000, Arizona's 15 different public library systems had a combined book stock of 8,723,000 volumes, and total circulation was 30,790,000. There were a total of 39,000 public libraries in the state. Principal public libraries include the Phoenix Public Library and the State Library and Department of Archives in Phoenix, and the Arizona Historical Society Library in Tucson. The largest university libraries are located at the University of Arizona and Arizona State University. Total income for the public library system amounted to $110,803,000 in 2000; including $997,227 in federal grants and $443,312 in state grants.
Arizona has more than 120 museums and historic sites. Attractions in Tucson include the Arizona State Museum, University of Arizona Museum of Art, Arizona Historical Society, Arizona-Sonora Desert Museum, Flandreau Planetarium, and Gene C. Reid Zoological Park. Phoenix has the Heard Museum (anthropology and primitive art), Arizona Mineral Resources Museum, Phoenix Art Museum, Phoenix Zoo, Pueblo Grande Museum, and Desert Botanical Garden. The Museum of Northern Arizona and Lowell Observatory are in Flagstaff. Kitt Peak National Observatory is in Tucson.
Archaeological and historical sites include the cliff dwellings at the Canyon de Chelly, Casa Grande Ruins, Montezuma Castle, Tonto, and Tuzigoot national monuments; the town of Tombstone, the site of the famous O. K. Corral gunfight in the early 1880s; and the restored mission church at Tumacacori National Monument and San Xavier del Bac Church near Tucson.