Categories: Maryland state parks | Forts in Maryland | Registered Historic Places in Maryland | Maryland geography stubs Image File history File links Flag_of_Maryland. ... Official language(s) None (English, de facto) Capital Annapolis Largest city Baltimore Area  Ranked 42nd  - Total 12,417 sq mi (32,160 km²)  - Width 90 miles (145 km)  - Length 249 miles (400 km)  - % water 21  - Latitude 37°53N to 39°43N  - Longitude 75°4W to 79°33... Assateague State Park is a public beach and state park of Maryland that lies at the northern end of Assateague Island. ... Calvert Cliffs State Park is a state park in Calvert County, Maryland, situated on the Chesapeake Bay. ... Dans Mountain State Park is located in Lonaconing, Maryland of Allegany County, Maryland. ... Deep Creek Lake is a popular vacation area in Garrett County, Maryland, USA. It surrounds a man-made lake that was created in 1923 by an electric company. ... The War Correspondents Memorial Arch Gathland State Park is a small state park located near Burkittsville, Maryland. ... Located just seven miles east of Cumberland, Maryland, Rocky Gap State Park encompasses over 3,000 acres (12 km²) of public land. ... Seneca Creek State Park encompasses 6,300 acres (25 km²) in western Montgomery County, Maryland near Germantown. ... Susquehanna State Park is a state park on the lower Susquehanna River north of Havre de Grace, Maryland. ... Front view of the Washington Monument located in the Washington Monument State Park in Washington County, Maryland. ... The National Park Service (NPS) is the United States federal agency that manages all National Parks, many National Monuments, and other conservation and historical properties with various title designations. ... Antietam National Battlefield is a unit of the National Park Service in Sharpsburg, Maryland, along Antietam Creek. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Scenic vista Catoctin Mountain Park is located near Thurmont in Frederick County, Maryland ( 39°39′ N 77°28′ W). ... The Clara Barton National Historic Site was established in 1975 at the former home in Glen Echo, Maryland outside Washington DC of Clara Barton (1821-1912), an American pioneer teacher, nurse, and humanitarian who was the founder of the American Red Cross. ... Fort McHenry Located in Baltimore, Maryland, Fort McHenry is best known for its role in the War of 1812, when it successfully defended Baltimore Harbor from the British navy. ... Fort Washington, located near Fort Washington, Maryland, was for many decades the only defensive fort protecting Washington D.C. The fort (maintained by the National Park Service) is a stone structure with a good cannon shot down the Potomac River. ... Greenbelt Park, located in Greenbelt, Maryland, is managed by the United States National Park Service. ... Historic Hampton Mansion The Hampton National Historic Site is a National Historic Site located in the United States community of Hampton, Maryland, just north of Baltimore, Maryland. ... Monocacy National Battlefield, is a unit of the National Park Service, the site of the Battle of Monocacy Junction in the American Civil War fought on July 9, 1864. ... Piscataway Park, located 20 miles south of downtown Washington, D.C. near Accokeek, Maryland, protects Marshall Hall and the National Colonial Farm. ... The Potomac Heritage Trail is a designated National Scenic Trail corridor in the United States that will connect various trails and historic sites through the states of Virginia, Maryland, the District of Columbia and Pennsylvania. ... Thomas Stone National Historic Site is a United States National Historic Site located about 25 miles (40 kilometers) south of Washington D.C. in southern Maryland. ...