California Missions: A Virtual Tour
Historic and contemporary photographs of each mission, sketches of mission life, annotated links to related online resources, and a History of Mission Music with sound clips.

California Missions Foundation
History and information about each of California's missions.

California Missions Studies Association
Directory of missions, articles on mission architecture, images of California missions, stories about mission life, and information about archaeological projects. Includes 3-D tours of some of the missions, a glossary, and related links. Searchable.

California Museum of Photography, University of California Riverside
Features historic photographs, essays, facts, and information on all 21 California Missions.

California State Parks
About the California Missions Trail, including addresses and phone numbers.