CALIFORNIA STATE HISTORICAL SITES (by COUNTY)
California Historical Landmarks are buildings, structures, sites, or places that have been determined to have statewide historical significance by meeting at least one of the following criteria:
The first, last, only, or most significant of its type in the state or within a large geographic region (Northern, Central, or Southern California),
Associated with an individual or group having a profound influence on the history of California,
A prototype of, or an outstanding example of, a period, style, architectural movement or construction or is one of the more notable works or the best surviving work in a region of a pioneer architect, designer or master builder.
San Luis Obispo