Elizabeth Hartwell Mason Neck National Wildlife Refuge

Gunston Hall is an 18th-century Georgian mansion near the Potomac River in Mason Neck, Virginia, United States. Built between 1755 and 1759 as the main residence and headquarters of a 5,500-acre (22 km2) plantation, the house was the home of the United States Founding Father George Mason. The home is located not far from George Washington's home.The interior of the house and its design was mostly the work of William Buckland, a carpenter/joiner and indentured servant from England. Buckland later went on to design several notable buildings in Virginia and Maryland. Both he and William Bernard Sears, another indentured servant, are believed to have created the ornate woodwork and interior carving. Gunston's interior design combines elements of rococo, chinoiserie, and Gothic styles, an unusual contrast to the tendency for simple decoration in Virginia at this time. Although chinoiserie was popular in Britain, Gunston Hall is the only house known to have had this decoration in colonial America.In 1792, Thomas Jefferson visited Gunston Hall for the last time, attending George Mason's death bed. After Mason's death, the house remained in use as a private residence for many years. In 1868, it was purchased by noted abolitionist and civil war Colonel Edward Daniels. It is now a museum owned by the Commonwealth of Virginia and open to the public. The National Society of The Colonial Dames of America (NSCDA) operates the museum as a joint effort with the Commonwealth of Virginia led by a Board of Regents selected by the NSCDA. The home and grounds were designated a National Historic Landmark in 1960 for their association with Mason.

Gunston Cove is an inlet of the Potomac River, at the confluence of Accotink Creek and Pohick Creek in Northern Virginia. The Cove forms the northern boundary of Mason Neck, once home to the revolutionary hero George Mason and now site of several regional parks and the Mason Neck National Wildlife Refuge. George Mason University's notable multi-decadal study of water quality and aquatic habitat in Gunston Cove and the adjacent Potomac River has illustrated how a tidal freshwater ecosystem can gradually recover from human-induced eutrophication following management of upstream nutrient pollution.

Mason Neck is a peninsula jutting into the Potomac River to the south of Washington, D.C., in the U.S. state of Virginia. It is surrounded by Belmont Bay to the west, the Potomac River to the south and east, Gunston Cove to the northeast, and Pohick Bay to the north-northeast. The census-designated place (CDP) of Mason Neck forms the southernmost section of Fairfax County, in northern Virginia, and comprises an area of 20.0 square miles (51.8 km2), two-thirds of which is preserved as parkland by regional, state, and national authorities. The population of the Mason Neck CDP was 2,005 as of the 2010 census.

George Mason (December 11, 1725 [O.S. November 30, 1725] – October 7, 1792) was an American planter, politician, Founding Father, and delegate to the U.S. Constitutional Convention of 1787, one of three delegates present who refused to sign the Constitution. His writings, including substantial portions of the Fairfax Resolves of 1774, the Virginia Declaration of Rights of 1776, and his Objections to this Constitution of Government (1787) opposing ratification, have exercised a significant influence on American political thought and events. The Virginia Declaration of Rights, which Mason principally authored, served as a basis for the United States Bill of Rights, of which he has been deemed a father. Mason was born in 1725, most likely in what is now Fairfax County, Virginia. His father died when he was young, and his mother managed the family estates until he came of age. He married in 1750, built Gunston Hall, and lived the life of a country squire, supervising his lands, family and slaves. He briefly served in the House of Burgesses and involved himself in community affairs, sometimes serving with his neighbor George Washington. As tensions grew between Great Britain and the North American colonies, Mason came to support the colonial side, using his knowledge and experience to help the revolutionary cause, finding ways to work around the Stamp Act of 1765 and serving in the pro-independence Fourth Virginia Convention in 1775 and the Fifth Virginia Convention in 1776. Mason prepared the first draft of the Virginia Declaration of Rights in 1776, and his words formed much of the text adopted by the final Revolutionary Virginia Convention. He also wrote a constitution for the state; Thomas Jefferson and others sought to have the convention adopt their ideas, but they found that Mason's version could not be stopped. During the American Revolutionary War, Mason was a member of the powerful House of Delegates of the Virginia General Assembly, but to the irritation of Washington and others, he refused to serve in the Continental Congress in Philadelphia, citing health and family commitments. In 1787, Mason was named one of his state's delegates to the Constitutional Convention and traveled to Philadelphia, his only lengthy trip outside Virginia. Many clauses in the Constitution bear his stamp, as he was active in the convention for months before deciding that he could not sign it. He cited the lack of a bill of rights most prominently in his Objections. He also wanted an immediate end to the slave trade and a supermajority requirement for navigation acts, fearing that restrictions on shipping might harm Virginia. He failed to attain these objectives, and again at the Virginia Ratifying Convention of 1788, but his prominent fight for a bill of rights led fellow Virginian James Madison to introduce the same during the First Congress in 1789; these amendments were ratified in 1791, a year before Mason died. Obscure after his death, Mason has come to be recognized in the 20th and 21st centuries for his contributions to the early United States and to Virginia.

Mason Neck State Park is located in Fairfax County, Virginia. The park is on a peninsula formed by Pohick Bay on the north, Belmont Bay on the south and the Potomac River to the east. The park has an area of 1,814 acres (7.34 km2) and is home to bald eagles, great blue herons, ospreys, and many other types of wildlife. The park also contains white-tailed deer and many species of lichen. Mason Neck State Park is one of the best locations to view bald eagles in northern Virginia. Sightings are most common in the mornings and evenings. The park is day-use only. Park hours are 8 a.m. to dusk. The park administration office is open weekdays from 8 a.m. to 3 p.m., closed state holidays. Mason Neck State Park has cultural significance with two sites on the state and National Register of Historic Places and approximately thirty other identified archaeological sites. The Taft archaeological site was listed in 2004 and the Lexington site was listed in 2013.

Chapman State Park is a public recreation and historic preservation area bordering the Potomac River in Charles County, Maryland. The state park preserves the mansion and grounds of Mount Aventine, the historic home of the Chapman family, who had significant ties to many of the Founding Fathers. The park's diverse, heavily wooded biosphere is home to many rare and disjunct plant and animal species. Several of the park's trees have been nominated for state and national big tree champion status. Recreational features include fishing, hunting, and several miles of hiking trails.

Pohick Bay Regional Park is a regional park on Pohick Bay of the Potomac River, in Fairfax County, northern Virginia.

Taft Archeological Site No. 029-5411 is a historic archaeological site located at Lorton, Fairfax County, Virginia. The site includes a multi-component, stratified, upland, prehistoric and possibly proto-historic (Dogue), American Indian camp covering a 50x80-meter area and dating to between ca. 2000 B.C. (based on Savannah River point) and A.D. 1560. The site was excavated in three stages in May through August 1987. The site is located in Mason Neck State Park.It was listed on the National Register of Historic Places in 2004.

Mount Aventine is a farm complex and national historic district located along the Potomac River in Bryans Road, Charles County, Maryland. The complex includes the main house; a second-quarter 19th century Greek Revival-influenced brick house. It was enlarged about 1860 to its present five-bay, center-passage, 2+1⁄2-story appearance. Also on the property are a 19th-century frame smokehouse, the site of another 19th-century house complex, late-19th /early-20th-century agricultural outbuildings, house and dairy barn complex built about 1900, historic roadbeds, a family cemetery, and sites of a 19th-century fishery and an 18th-century house.Its former cupola was used as a signal station by the Federal government during the American Civil War. The Chapman family owned the Mt. Aventine tract from 1751 until 1916, and the ferry operated by them was one of several important crossings of the Potomac River connecting Northern Virginia to Maryland.It was added to the National Register of Historic Places in 1996, and since 1998 has been preserved as part of Chapman State Park.The house is open for tours during special events hosted by the Friends of Chapman State Park.

Indian Head is a town in Charles County, Maryland, United States. The population was 3,894 at the 2020 U.S. Census. It has been the site of a naval base specializing in gun and rocket propellants since 1890. Production of nitrocellulose and smokeless powder began at the Indian Head Powder Factory in 1900. The name of the base has varied over the years from Indian Head Proving Ground, to Naval Powder Factory, to Naval Propellant Plant, to Naval Ordnance Station, to the present Naval Support Facility Indian Head. The facility's main tenant activity is the Indian Head Naval Surface Warfare Center (NSWC/IH). Advanced research in energetic systems takes place at NSWC/IH. NSWC/IH absorbed the function of the closed Naval Ordnance Laboratory, formerly in White Oak. The base currently employs 3,700 people.

Potomac Heights is a census-designated place (CDP) in Charles County, Maryland, United States. The population was 1,117 at the 2010 census. It has a volunteer fire department and numerous older rambler homes built for workers at the nearby U.S. Navy munitions plant in Indian Head (now known as the Indian Head Naval Surface Warfare Center).

Belvoir was the plantation and estate of colonial Virginia's prominent William Fairfax family. Operated with the forced labor of enslaved people, it sat on the west bank of the Potomac River in Fairfax County, Virginia, at the present site of Fort Belvoir. The main house — called Belvoir Manor or Belvoir Mansion — burned in 1783 and was destroyed during the War of 1812. The site has been listed on the National Register of Historic Places since 1973 as "Belvoir Mansion Ruins and the Fairfax Grave."