Antietam National Battlefield is a National Park Service protected area along Antietam Creek in Sharpsburg, Maryland which commemorates the American Civil War Battle of Antietam that occurred on September 17, 1862. The area, situated on fields among the Appalachian foothills near the Potomac River, features the battlefield site and visitor center, a national military cemetery and a field hospital museum. Today, over 330,000 people visit the park each year.