the National Register of Historic Places in Massachusetts Buildings and structures in Saugus, Massachusetts Foundries in the United States Historic Mechanical Engineering Landmarks Industrial archaeological sites in the United States Industrial buildings and structures on the National Register of Historic Places in Massachusetts Industry museums Industry museums in Massachusetts Museums in Essex County, Massachusetts National Historic Landmarks in Massachusetts National Historic Sites in Massachusetts National Register of Historic Places in Essex County, Massachusetts Open-air museums in Massachusetts Protected areas established in 1968 Historic districts on the National Register of Historic Places in Massachusetts 1968 establishments in Massachusetts