Seneca Historic District (Poolesville, Maryland)

Seneca is an unincorporated community in Montgomery County, Maryland, United States. It is located near the intersection of River Road and Seneca Creek, not far from the Chesapeake and Ohio Canal (C&O Canal) and Potomac River. Its history goes back before the American Revolutionary War and it thrived when the canal was operating—having several warehouses, mills, a store, a hotel, and a school. Fighting occurred in the area on more than one occasion during the American Civil War. The community declined as the C&O Canal declined. Today (2020), the community uses a Poolesville ZIP code, but is part of the Darnestown census-designated place. The Seneca schoolhouse is a museum, and nearby Riley's Lock and lock house are part of the Chesapeake and Ohio Canal National Historical Park. The community is located near the Dierssen Wildlife Management Area and the McKee-Beshers Wildlife Management Area. Since 1978, Seneca and additional territory have been part of the Seneca Historic District.

Seneca Quarry is a historic site located at Seneca, Montgomery County, Maryland. It is located along the Chesapeake and Ohio Canal on the north bank of the Potomac River, just west of Seneca Creek. The quarry was the source of stone for two Potomac River canals: the Patowmack Canal (opened in 1802, and officially known as the Great Falls Skirting Canal) on the Virginia side of Great Falls; and the C&O Canal, having supplied red sandstone for the latter for locks 9, 11, 15 - 27, and 30, the accompanying lock houses, and Aqueduct No. 1, better known as Seneca Aqueduct, constructed from 1828 to 1833. Seneca red sandstone, also known as redstone, formed during the Late Triassic age, 230 to 210 million years ago. The current geological name is Poolesville Member of Manassas Sandstone. Iron oxide gives the sandstone its rust color. It was prized for its ease of cutting, durability and bright color.The stone quarried here for the Smithsonian Castle was originally described as "lilac grey" in color when quarried," but turned rusty red as it weathered.Numerous quarries operated on the one-mile stretch of the Potomac River west of Seneca Creek. The C&O Canal provided a way for the heavy sandstone to reach the Washington, D.C. market, and the quarry's success is attributed to the canal. The Peter family of Georgetown, which built Tudor Place, owned the quarry from 1781 until 1866. John P.C. Peter, a great-grandson of Martha Washington, made the quarry into a commercial success by utilizing the C&O and winning the bid to supply red sandstone for the Smithsonian Castle, constructed 1847-1855. Peter built the stonecutting mill, drawing power from the adjacent canal turning basin. He also built a miniature of Tudor Place near the quarry called Montevideo, now owned by the Kiplinger family. Seneca Quarry provided the stone for hundreds of buildings around the Washington, DC area, including houses in the Dupont Circle and Adams Morgan area, the James Renwick Jr.-designed Trinity Episcopal Church (1849; demolished 1936), Luther Place Memorial Church (1873), and the D.C. Jail in the 1870s. Montgomery C. Meigs purchased the Government Quarry nearby for the Washington Aqueduct project in the 1850s, and that quarry provided stone for the parapet of the Union Arch Bridge, better known as the "Cabin John Bridge," the Washington Aqueduct Dam at Great Falls, McClellan Gate at Arlington National Cemetery, as well as the mile-long boundary wall that surrounds the cemetery. After the American Civil War, the Seneca Sandstone Company purchased the quarry in 1866, expanding the stonecutting mill in 1868, but went bankrupt in 1876 after financial mismanagement, sometimes referred to as the "Seneca Stone Ring Scandal." It was closed for seven years. In 1883, the Potomac Red Sandstone Company reopened the quarry but only operated until 1889, when the Great Flood of 1889 knocked out the C&O Canal for two years. Baltimore quarry operator George Mann purchased the Seneca quarry in 1891 and operated it for the next decade. By 1901, quarrying operations had stopped as the quality of the rock diminished and Victorian architecture was no longer in vogue.The Seneca Schoolhouse, a small one-room schoolhouse of red sandstone, was built in 1866 to educate the children of the stone cutters who worked at the quarry. Located in Poolesville, Maryland, it provides tours to schoolchildren so that they can experience a typical school day as it would have been on March 13, 1880.Seneca Quarry is now overgrown with sycamore trees, tulip poplars, and dense brush such as wild rose, such that it is impenetrable much of the year. It is best visited in winter. The property includes ruins of the stonecutting mill, located at "the Junction of Seneca Creek and the C&O Canal, just NW of the aqueduct" and the restored quarry master's house, located within Seneca Creek State Park. The quarry proper, Seneca Aqueduct, and the quarry cemetery are all part of the Chesapeake and Ohio Canal National Historical Park. The quarry falls within the boundaries of the Seneca Historic District. Seneca Quarry was listed on the National Register of Historic Places in 1973.

Seneca Aqueduct — or Aqueduct No. 1 — is a naviduct that carries the Chesapeake and Ohio Canal (C&O) over Seneca Creek in Montgomery County, Maryland. The C&O built eleven aqueducts along its 184.5 miles (296.9 km) length. Seneca Aqueduct is a unique structure, not only being the first built, but also the only red sandstone aqueduct on the C&O−and the only aqueduct that is also a lock (Lock 24, or Riley's Lock). It is located at the end of Riley's Lock Road in Seneca, Maryland.

Seneca Creek is a 5.8-mile-long (9.3 km) stream in Montgomery County, Maryland, USA, roughly 16 miles (26 km) northwest of Washington, D.C. It drains into the Potomac River.

"The River of Blood" is a monument located on a golf course in Lowes Island, Virginia, owned by former President of the United States Donald Trump. A plaque signed with Trump's name states that the monument marks what Trump claims is an American Civil War battle site having significant casualties, although no listed battle or publicly disclosed event with any recorded casualties took place at the site.

Lowes Island is a census-designated place (CDP) in Loudoun County, Virginia, United States. The population as of the 2010 United States Census was 10,756. Along with nearby Countryside and Cascades, it is considered one of the three main components of the Potomac Falls community (ZIP code 20165). The community takes its name from an island on the south shore of the Potomac River.

Valley Mill is a children's day summer camp and kayaking school in Germantown, Maryland. It is accredited by the American Camp Association.

Sharpshin Island ("Sharkskin Island" on some maps) is an island on the Potomac River in Maryland.

Dawsonville is an unincorporated community in Montgomery County, Maryland, United States.

Kunzang Palyul Choling (KPC) is an organization for Buddhist study and practice in the Nyingma tradition (Palyul lineage) that is located in Poolesville, Maryland and Sedona, Arizona, with smaller groups in Santa Barbara, California and across Australia. KPC was founded by Jetsunma Ahkon Lhamo and later given to Penor Rinpoche. KPC was Penor Rinpoche's first Dharma Center in the US.

Trump National Golf Club, Washington, D.C. is an 800-acre (1.3 sq mi) private golf club in the eastern United States, at Lowes Island in Potomac Falls, Virginia, northwest of Washington, D.C. It is part of the Trump chain of golf clubs that includes clubs in Los Angeles, Philadelphia, and Bedminster. The club contains two 18-hole golf courses, both par 72. The Championship Course was designed by Tom Fazio, and the Riverview course was added in 1999, when the club was still known as the Lowes Island Club. The Riverview Course abuts the Potomac River and was originally designed by Arthur Hills. The club also contains a 50,000-square-foot (4,600 m2) clubhouse, an 82-foot (25 m) swimming pool, an indoor tennis center, and a fitness center.

Darnall Place is a historic farm complex located at Poolesville, Montgomery County, Maryland, United States. The farm complex consists of four small 18th-century stone buildings, a 19th-century frame wagon shed/corn crib, a 20th-century concrete block barn, and three late-19th- or early-20th-century frame sheds. The stone buildings are all constructed of red-brown Seneca sandstone. The one-story dwelling has a large external stone chimney on the east end. The farmstead is reminiscent of those in Europe or the British Isles.Darnall Place was listed on the National Register of Historic Places in 1979.