The Old Castle is also home to the State Museum of Württemberg which was founded in 1862 by William I of Württemberg. The museum traces the rich history of Württemberg with many artifacts from its dukes, counts and kings, as well as earlier remnants dating back to the Stone Age. On the Karlsplatz side of the Old Castle is a museum dedicated to the memory of Claus Schenk Graf von Stauffenberg, former resident of Stuttgart who attempted to assassinate Adolf Hitler on 20 July 1944.