Alverta Green Museum, Mason Ohio Historical Society Learn about the history of Mason, Ohio The Mason Historical continuing interest Society's mission is to create, promote and preserve a in the history and heritage of Mason, the surrounding area, and the State of Ohio. To collect, preserve and exhibit for educational and cultural purposes, all types of historical artifacts, records, structures and matters as are of particular interest to Mason and the surrounding areas. And to maintain and expand the Alverta Green Museum, along with any future facilities