proper. Interwiki: cite web » url=http://www.missionscalifornia.com/keyfacts/san-diego-de-alcala.html |title=Keyfacts |publisher=missionscalifornia.com |accessdate=July 1, 2010 Mission San Diego was the southern anchor in California of the historic mission trail El Camino Real . Both the Presidio and the Mission are National Historic Landmarks . Interwiki: cite web » url=http://www.missionsandiego.com/ |title=Mission San Diego |publisher=Mission San Diego |accessdate=July 1,