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The National Register of Historic Places is the nation’s official list of buildings, structures, objects, sites, and districts worthy of preservation because of their significance in American history, architecture, archeology, engineering, and culture. 

The California Register of Historical Resources (California Register) includes buildings, sites, structures, objects and districts significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California.

Nationally Designated Historical Landmarks, State Designated Landmarks and points of Interest by California County can be found here: Office of Historic Preservation.