Newlin Grist Mill is a nonprofit historic and nature site in Glen Mills, PA. We care for 160 acres of open space and over 12 historic buildings, including the iconic Newlin Grist Mill, originally built in 1704 and one of the oldest continually operating mills in the United States. Mill tours are offered during the week, and the grounds and trails are free to access year-round. Whether you come for a tour, walk the grounds, picnic by the stream, or attend one of our special events, there's something for everyone at Newlin Grist Mill!