21 missions were established by the Franciscan monks from the Roman Catholic church which are peppered throughout California. These missions are located from San Diego to Sonoma. They're constructed in Spanish style and much of the labor is attributed to the Native Americans. These missions played a large role in the colonization of California and paved the way for the Golden State we know today. Here is a direct link to the list (which you can view online and download as a PDF): https://docs.google.com/file/d/0B8eEAMxReDq1NTJraG55amlXdms/edit?usp=sharing
A great resource for detailed information on individual missions is CaliforniaMissions.com, http://www.missionscalifornia.com/
