Ringwood Manor is a National Historic Landmark District, having historical importance spanning from Native American occupation through the early 20th century. The surrounding Ramapo Mountains' rich magnetite iron deposits made the area a major iron supplier and became the home to a succession of ironmasters for over two hundred years. During the Gilded Age, Ringwood Manor became a large summer estate for partners Peter Cooper and Abram S. Hewitt and their families. In 1938, the house, its contents, and the surrounding property were donated by the family to the State of New Jersey as a museum and a state park. With original historical structures, gardens, and landscapes on 582 acres and extensive historical collections illustrative of family life, community, industry and culture, Ringwood Manor is a unique repository of American history.
Today, Ringwood Manor is a central part of Ringwood State Park and administered by the NJ Department of Environmental Protection, Division of Parks and Forestry.