Orange and Alexandria Railroad Bridge Piers

Hemlock Overlook Regional Park is a multi-use park near Clifton, Virginia, one of several parks lining the Bull Run. The 400-acre park offers dense forests, hilly woodlands, and floodplain scenery. Hemlock Overlook is named after the grove of hemlock trees above the banks in the northern section of the park. At the northern edge of the park is the site of the Union Mills and the bridge crossing for the Orange and Alexandria Railroad over the Bull Run; both of these sites have high significance in the Battles of Bull Run. The site of a dam that supported the first hydroelectric power generation to Fairfax County is also on the Hemlock Overlook site. A permanent orienteering course, built with the support of the Quantico Orienteering Club, sits in the southern end of the park, south of Yates Ford Road. The Bull Run-Occoquan Trail (blue trail) is maintained by the PATC. From 1984 to 2009, Hemlock Overlook operated as a university outdoor education center, through a partnership between George Mason University and the Park Authority. In 2009, the Park Authority engaged a partner, Adventure Links, to operate the facility. In 2021, the Park Authority put out a Request for Proposal for new operating partners. A new operator, Horizons at Hemlock Overlook, part of Endless Horizons, has been chosen to partner with the Park Authority.

"A" Fort and Battery Hill Redoubt-Camp Early, also known as Measles Fort, is a historic American Civil War military facility and redoubt located in Fairfax County, Virginia south of Centreville and along Bull Run. It was listed on the National Register of Historic Places in 1998.

Manassas Park station is a Virginia Railway Express station in Manassas Park, Virginia. The station serves the Virginia Railway Express Manassas Line, and shares the right-of-way with Amtrak's Cardinal and Crescent trains; however, no Amtrak trains stop here.

Conner House is a historic house located in Manassas Park, Virginia. The main section was built about 1810, with a later wing added in 1855. It is a two-story, gable-roof, stone residence. The Conner House served from July to November 1861 as the headquarters of General Joseph E. Johnston, commander of the Confederate Army during the first several months of its existence. In 1973 the Town (now City) of Manassas Park purchased the house and yard.It was added to the National Register of Historic Places in 1981.

Signal Hill is a historic Confederate Army military site in Prince William County, Virginia. It is from this location, a signal station atop the hill, that Confederate observers in 1861 spotted Union Army troops attempting to cross Sudley Ford. The Confederate response to this maneuver began the First Battle of Bull Run.Part of Signal Hill is now part of a public park owned by the city of Manassas Park; the rest is part of a preservation area belonging to a neighborhood association. The site was listed on the National Register of Historic Places in 1989.

Manassas Park is an independent city in the U.S. state of Virginia. As of the 2020 census, the population was 17,219. Manassas Park is bordered by the city of Manassas and Prince William County. Manassas Park is a part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area.

Osbourn Park High School is a Prince William County, Virginia public high school in a small county island between the cities of Manassas and Manassas Park, southwest of Washington D.C. Osbourn Park serves the mid-part of the county. The community consists of business, professional, U.S. Government and military residents. Osbourn Park has also been designated as The Biotechnology Center and houses two other unique programs: Allied Health and NJROTC. It has at various times had a student population ranging from 1900 to 3200, but it is currently around 2500 grades 9-12.

Yorkshire is a census-designated place (CDP) in Prince William County, Virginia, United States. It is an annex of Manassas, Virginia. The population was 6,732 at the 2000 census.

Clifton Historic District is a national historic district located at Clifton, Fairfax County, Virginia. It encompasses 62 contributing buildings, 1 contributing site, and 1 contributing object in the town of Clifton. They include 53 residences, 3 churches, 4 commercial buildings, and 2 local government buildings mostly built between 1880 and 1910. Notable buildings include the Clifton Presbyterian Church (1871), Clifton Baptist Church (1912), Clifton Hotel (1869), the Mayhugh Tavern (c. 1870), the Ford House (c. 1880), the Cross House (c. 1886), Buckley Brothers Store (c. 1900), the M. M. Payne House (1903), and "Red Gables" (1908).It was listed on the National Register of Historic Places in 1985.

Clifton is an incorporated town located in southwestern Fairfax County, Virginia, United States, with a population of 282 at the time of the 2010 census, up from 185 at the 2000 census. Incorporated by the General Assembly on March 9, 1902, Clifton is one of only three towns in the county, the other two being the much more populous Vienna and Herndon. Clifton's history begins pre-colonially, when the area was used as hunting grounds by the local Dogue Native American tribe. A railroad siding was constructed here during the Civil War, and the area became titled as Devereux Station. A nearby neighborhood on the outskirts of the Clifton ZIP code has this name. Development of a village at the siding began in 1868 when a railroad depot, named "Clifton Station", was constructed. Unlike most areas in Northern Virginia, the land around Clifton is far less built up than nearby areas, especially to its east and southwest. This was out of the worry that overdevelopment near Bull Run and the Occoquan River would be environmentally damaging to the Occoquan Reservoir. Consequently, as development edged near the area in the late 1970s and early 1980s, an ordinance was enacted stating that only one building could be placed on 5-acre (2.0 ha) parcels that have not already been divided. Today, the southern and eastern portions of the area are heavily forested, with single-family homes, while the northern area has become equestrian areas.

Clifton station is a limited-use Virginia Railway Express train station in Clifton, Virginia. The location serves as a station stop during special seasonal events in the town, most notably the town's annual Clifton Day. It is served by special Manassas Line trains running between Manassas station and Rolling Road station. A temporary platform is erected for when the station is in use.

The Mayfield Fortification is a historic American Civil War earthworks at 8401 Quarry Road in Manassas, Virginia. It is one of a series of fortifications constructed by the Confederate Army to defend the critical Manassas railroad junction in 1861. The fort consisted of earthworks with log revetments, and was built by local Confederate troops and slave labor. After 1862 the fort was sporadically occupied by Union forces.The site was listed on the National Register of Historic Places in 1989. It is now a city park.