Old Main is a historic building on the campus of Pennsylvania Western University California (known before July 2022 as California University of Pennsylvania) in California, Pennsylvania. It is designated as a historic public landmark by the Washington County History & Landmarks Foundation. References External links [ National Register nomination form] University and college buildings on the National Register of Historic Places in Pennsylvania School buildings completed in 1868 Buildings and structures in Washington County, Pennsylvania California University of Pennsylvania University and college administration buildings in the United States National Register of Historic Places in Washington County, Pennsylvania