Antietam National Battlefield near Sharpsburg 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.
Antietam National Cemetery, whose 11.36 acres contain 5,032 interments, 1,836 unidentified, adjoins the park. Civil War interments occurred in 1866. The cemetery contains only Union soldiers from the Civil War period. Confederate dead were interred in the Washington Confederate Cemetery within Rosehill Cemetery, Hagerstown, Maryland, Mt. Olivet Cemetery in Frederick, Maryland; and Elmwood Cemetery in Shepherdstown, West Virginia. The cemetery also contains the graves of veterans and their wives from the Spanish-American War, World War I and II, and the Korean War. The cemetery was closed in 1953. An exception was made in 2000 for the remains of USN Fireman Patrick Howard Roy who killed in the attack on the USS Cole. The Antietam National Cemetery was placed under the War Department on July 14, 1870; it was transferred to the National Park Service on August 10, 1933.
Chesapeake and Ohio Canal National Historical Park on the Potomac River is a United States National Historical Park located in the District of Columbia and the states of Maryland and West Virginia. The park was established as a National Monument in 1961 by President Dwight D. Eisenhower in order to preserve the neglected remains of the Chesapeake and Ohio Canal along the Potomac River along with many of the original canal structures. The canal and towpath trail extends from Georgetown, Washington, D.C. to Cumberland, Maryland, a distance of 184.5 miles (296.9 km).
Source: Answers.com, Wikipedia, and Maryland.gov