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Photo: via Wikimedia Commons, Public domain
Harmony Hall mansion is on 62.5 acres of open pasture lands along the Potomac River. Built in 1769 as Battersea, it is the oldest building in Prince George's County. It has been owned by the National Park Service since 1966; the building and grounds are being renovated to restore the historical site.
Harmony Hall, located in Fort Washington, Maryland, is managed by the United States National Park Service as part of the National Capital Parks-East system. It has been a National Park Service site since 1966. Harmony Hall is a 2+1⁄2-story Georgian country house built of red brick during the eighteenth century. It is surrounded by 65 acres (26 ha) of land on Broad Creek, a Potomac River tributary.
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Harmony Hall Regional Center includes an art gallery, fitness room, playground, classes and facilities and programs for seniors, adults, teens and children. The John Addison Concert Hall holds concerts and is the performance location for the amateur theater group, Tantallon Community Players.
Fort Foote is a historical fort that defended Washington DC against naval attack on the Potomac River. It was active during the US Civil War, from 1863 to 1878, with brief usage during World War I and II. It has been part of the US National Park Service since the end of World War II. The park contains two Civil War cannons and has opportunities for hiking and fishing.
Fort Washington is the historical fort that defended Washington DC against naval attack on the Potomac River. It was built in 1809 and was active during the War of 1812 and was an important site in the US Civil War. It became part of the US National Park Service in 1946. The visitor's center has displays about the history. The fort has panoramic views of the Potomac River; one Sunday per month from April to October the park has Civil War artillery demonstrations. The grounds are bordered by the Potomac River with opportunities for fishing, bird watching and sighting other wildlife. There is a 3-mile perimeter trail along the river and through the woods around the park.