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Fort Washington is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. It borders the Potomac River, situated 20 miles south of the downtown Washington, DC. As of the 2020 census it had a population of 24,261. The Fort Washington community is located west of Maryland Route 210, with some additional area to the east of the highway.

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.The house was built circa 1769 by Enoch Magruder. After his death, the estate was given to his daughter, Sarah and her husband, Col. William Lyles. The estate was originally called Battersea, but came to be called Harmony Hall some time after 1792, when it was rented to brothers John and Walter Dulaney Addison and their wives. The name "Harmony Hall" commemorates the two couples' harmonious coexistence. Harmony Hall was sold by the Lyles family in 1850. After passing through other owners, the manor was purchased in about 1892 by Robert Stein, his brother Richard, and brother-in-law Joseph Adler. The three had immigrated from Silesia, and engaged in truck farming nearby. They lost control of the manor house in 1929, selling it to Charles Collins, but continued to farm and operate a general store in the area.The home was extensively restored beginning in 1927 by Charles Wallace Collins (1879–1964), a lawyer, writer, and librarian who made his home in Harmony Hall and devoted himself to its restoration after he retired. Collins bequeathed the house to the National Park Service.Beginning in 1985, Frank Calhoun leased the mansion and lived there, investing more than $1 million into the house and its upkeep. After he fell behind on renovations in his early 60s, the Park Service asked Calhoun to leave in 1999. The property has been empty and in accelerating decline since then. Though the Park Service periodically sends in staff and enlists students to clean up the grounds, Harmony Hall competes with many other historic properties for attention and funding.The home has been listed on the National Register of Historic Places since 1980, at which time its condition was described as "excellent". As of January 2010, Harmony Hall is closed to the public.Harmony Hall is also the name given to a community center building, on adjacent property, owned by the Maryland-National Capital Park and Planning Commission and used as their southern area headquarters office. The center includes a fitness center and hosts concerts, stage plays, art exhibits, arts classes, scout meetings, and other cultural programs. The building was originally an elementary school.

Tantallon is an unincorporated community in Prince George's County, Maryland, United States. Although a separate community, it is a part of the census-designated place (CDP) of Fort Washington. The ZIP code for the community is 20744. Tantallon reported as a census-designated place by the U.S. Census Bureau in 1980, which included much of the northern half of Fort Washington's census area. The population recorded was 9,945.

St. John's Church, St. John's Episcopal Church, or St. John's Episcopal Church, Broad Creek (formerly King George's Parish), is a historic Episcopal church located at 9801 Livingston Road in Fort Washington, Prince George's County, Maryland. It is a rectangular Flemish bond brick structure with a bell hipped roof. The interior features a barrel vaulted ceiling with an intricate support system.

Broad Creek in Prince George's County was the first footprint of European settlement in the immediate counties around what would become the nation's capital, Washington, D.C. The area is part of greater Fort Washington. The area was settled by Europeans in the 1660s and the town was created in 1706 when the colonial Maryland Legislature authorized surveying and laying out the towns of Queen Anne Town, Nottingham, Mill Town, Piscataway, Aire (also known as Broad Creek) and Upper Marlboro (then known as Marlborough Town).In 1747, the legislature tried to improve the quality and the method of marketing tobacco, then the major crop of the area, and established a formal system of tobacco inspection and quality control. The town was home to one of seven state tobacco warehouses built in Prince George's County.The site is located 9 miles (14 km) south of the U.S. Capitol building on the Potomac River. Today, this "first footprint" of settlement in the capital area is a Prince George's County Historic District, with three 17th century homesites and an 18th-century Episcopal Church structure. The Broad Creek Historic District comprises 900 acres (3.6 km2) along the Potomac River, and is remarkable for its environmental resources, as well as its 12,000-year-old Indian archeological discoveries. It was placed on the National Register of Historic Places on December 8, 2011.

Warburton Manor was the colonial home, patented in 1661, of the Digges Family, descendants of Edward Digges, who was Governor of Virginia from 1652 to 1668. Digges was an intimate friend of George and Martha Washington, who visited the house many times. George Washington spent his forty-third birthday at Warburton Manor. Warburton Manor occupied a strategic site on the Potomac River and today it is the site of Fort Washington, designed by Pierre Charles L'Enfant in 1814.

Fort Washington, located near the community of Fort Washington, Maryland, was for many decades the only defensive fort protecting Washington, D.C. The original fort, overlooking the Potomac River, was completed in 1809, and was begun as Fort Warburton, but renamed in 1808. During the War of 1812, the fort was destroyed by its own garrison during a British advance. The current historic fort—maintained by the National Park Service—was initially constructed in 1824. It is a stone structure with a good cannon shot down the Potomac River. The fort was extensively remodeled in the 1840s and 1890s. The Fort was turned over to the U.S. Department of the Interior in 1946 after its last military personnel departed.The expansive grounds of the present Fort Washington Park, with its extensive hiking/bicycle paths and river view, are a scenic venue for picnicking, fishing, and outdoor recreation. Historical re-enactments are held periodically at the Fort, and there is a small museum. In 2006, repairs were done to shore up the crumbling outer wall, in preparation for the 200th anniversary. The Fort Washington Light, located below the fort, was established in 1857. The current tower, standing 28 feet tall, was constructed in 1882.

Arcturus is a neighborhood within the unincorporated community of Fort Hunt, Virginia in Fairfax County, Virginia, United States. Arcturus lies south of Alexandria between the George Washington Memorial Parkway and the Potomac River.

Collingwood was a historic mansion in Fort Hunt, Virginia listed on the Fairfax County Inventory of Historic Sites. The mansion was first built in 1859 on a subdivision of George Washington's former River Farm, and significantly altered and expanded in the early 20th century. In July 2019, it was reported that the mansion would be demolished later that year.

River Farm (25 acres (10 ha)), permanent home to the American Horticultural Society (AHS) headquarters, is a (27 acres (11 ha)) landscape located at 7931 East Boulevard Drive, Alexandria, Virginia. The estate takes its name from a larger plot of land which formed an outlying part of George Washington's Mount Vernon estate.

Fort Foote was an American Civil War-era wood and earthwork fort that was part of the wartime defenses of Washington, D.C., which helped defend the Potomac River approach to the city. It operated from 1863 to 1878, when the post was abandoned, and was used briefly during the First and Second World Wars. The remnants of the fort are located in Fort Foote Park, which is maintained by the National Park Service as part of the National Capital Parks-East system. The area's mailing address is Fort Washington, Maryland.

Friendly is an unincorporated area and census-designated place (CDP) in Prince George's County, Maryland, United States, with an African-American majority population, located a few miles south of Washington, D.C. The population was 9,937 at the 2020 census.Friendly had its own rural post office in the early 20th century, and is now under the mailing address Fort Washington. The name "Friendly" is most associated with Friendly High School, which serves most of the greater Fort Washington area. The Friendly area was largely rural until about 1960 and has steadily grown with single-family housing developments. At least five new residential neighborhoods are currently under construction in the area. Allentown Road connects Friendly with Andrews Air Force Base.