A small private museum displaying glass from Geo Duncan & Sons and Duncan & Miller Glass Companies made from 1867 to 1955. The museum is owned by The National Duncan Glass Society. Awarded a Georgie Washington County Historical Society Hall Of Fame 2019. The Duncan & Miller Glass Museum is open April - December from 11 AM - 4 PM Thursday through Sunday, and year-round by appointment. We welcome group tours and offer special pricing for participants. We are located at 100 Ridge Avenue, Washington, PA 15301