Located in the center of the Greenbank Mill National Historic District, the Mill and its surroundings provide a fascinating glimpse of Delaware life in the late 18th and early 19th centuries. One of the more interesting features of the site is its herd of heritage sheep. An extensive series of living history programs and special events are offered. Hours of Operation: April - October: Saturdays (10:00 a.m. - 4:00 p.m.) except holiday weekends. Greenbank Mills & Philips Farm is also available year-round for group programs by reservation.