The Visitor Center at Antietam National Battlefield is open from 8:00 A.M. to 6:00 P.M. from Memorial Day to Labor Day, and from 8:30 A.M. to 5:00 P.M. the rest of the year. The park is open from dawn to dusk year-round. For more information, write or call the Antietam National Battlefield Visitor Center, P.O. Box 158, Sharpsburg, MD 21782/Tel: 301-432-5124.