King Street–Old Town station

Ronald Reagan Washington National Airport, sometimes referred to colloquially as National Airport, Washington National, Reagan National, DCA, Reagan, or simply National, is an airport in Arlington County, Virginia, across the Potomac River from Washington, D.C. It is the smaller of two airports operated by the Metropolitan Washington Airports Authority (MWAA) that serve the Washington metropolitan area around Washington, D.C.; the larger is Dulles International Airport about 25 miles (40 km) to the west in Fairfax and Loudoun counties. The airport is 5 miles (8.0 km) from downtown Washington, D.C., and the city is visible from the airport.

Huntington is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 11,267 at the 2010 census. It is located next to the southern border of the city of Alexandria and is part of the Washington metropolitan area. Its main component is the namesake Huntington subdivision, a late-1940s neighborhood of mainly duplex homes.

Braddock Road is an island-platformed Washington Metro station in Alexandria, Virginia, United States. The station was opened on December 17, 1983, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Providing service for both the Blue and Yellow Lines, the station is located at Braddock Road and West Street.

Eisenhower Avenue is a rapid transit station on the Yellow Line of the Washington Metro in Alexandria, Virginia. It opened on December 17, 1983.

Huntington is an island-platformed Washington Metro station in the Huntington area of Fairfax County, Virginia, United States. The station was opened on December 17, 1983, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Serving as the southern terminus for the Yellow Line, the station is built into a hillside; the south mezzanine, along with escalator access, is accessible via an incline elevator.

Ronald Reagan Washington National Airport station is a Washington Metro station in Arlington, Virginia on the Blue and Yellow Lines. The station platform is elevated and covered and is the last above-ground station on the Yellow Line in Virginia, heading into Washington, D.C. It is one of only two stations in the system to have three tracks. The station is located across Smith Boulevard from Terminal 2 at Ronald Reagan Washington National Airport; the mezzanine is directly connected to Level 2 of the terminal by two pedestrian bridges. Airport shuttle buses or a walkway connect the station and Terminal 1. The airport's Abingdon Plantation historical site is near the station.

Potomac Yard station is a Washington Metro station under construction in Alexandria, Virginia, United States. The station will be operated by the Washington Metropolitan Area Transit Authority (WMATA), serving both the Blue and Yellow Lines, and is expected to open in May 2023. The station will be located at Alexandria's planned 7.5-million-square-foot (700,000 m2) Potomac Yard mixed-use development bounded by Richmond Highway and the George Washington Memorial Parkway. Upon its completion, Potomac Yard will be the second infill station to be added to the Washington Metro system, after NoMa–Gallaudet U in 2004. Potomac Yard station is being constructed on the site of Potomac Yard, a former railroad freight yard.

An elevated railway or elevated train is a rapid transit railway with the tracks above street level on a viaduct or other elevated structure. The railway may be broad-gauge, standard-gauge or narrow-gauge railway, light rail, monorail, or a suspension railway. Elevated railways are normally found in urban areas where there would otherwise be multiple level crossings. Usually, the tracks of elevated railways that run on steel viaducts can be seen from street level.

An island platform is a station layout arrangement where a single platform is positioned between two tracks within a railway station, tram stop or transitway interchange. Island platforms are popular on twin-track routes due to pragmatic and cost reasons. They are also useful within larger stations where local and express services for the same direction of travel can be provided from opposite sides of the same platform thereby simplifying transfers between the two tracks. An alternative arrangement is to position side platforms on either side of the tracks. The historical use of island platforms depends greatly upon the location. In the United Kingdom the use of island platforms is relatively common when the railway line is in a cutting or raised on an embankment, as this makes it easier to provide access to the platform without walking across the tracks.

The Blue Line is a rapid transit line of the Washington Metro system, consisting of 27 stations in Fairfax County, Alexandria and Arlington, Virginia; the District of Columbia; and Prince George's County, Maryland, United States. The Blue Line runs from Franconia–Springfield to Downtown Largo. The line shares tracks with the Orange Line for 13 stations, the Silver Line for 18, and the Yellow Line for six. Only three stations are exclusive to the Blue Line.

Huntington is an island-platformed Washington Metro station in the Huntington area of Fairfax County, Virginia, United States. The station was opened on December 17, 1983, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Serving as the southern terminus for the Yellow Line, the station is built into a hillside; the south mezzanine, along with escalator access, is accessible via an incline elevator.

Eisenhower Avenue is a rapid transit station on the Yellow Line of the Washington Metro in Alexandria, Virginia. It opened on December 17, 1983.

Franconia–Springfield is a Washington Metro rapid transit station and Virginia Railway Express commuter rail station located in Springfield, Virginia, United States. The station is the southwestern terminus of the Metro Blue Line and an intermediate station on the VRE Fredericksburg Line. It is also a major bus terminal for Fairfax Connector buses, plus other local and intercity bus routes. The station has one island-platform serving the two Metro tracks, plus two side platforms serving the RF&P Subdivision on which the Fredericksburg Line runs.

Van Dorn Street is a Washington Metro station straddling the boundary between Fairfax County and the independent city of Alexandria in Virginia, United States. The station’s island platform lies in unincorporated Rose Hill in Fairfax County, while the station’s entrance and parking facilities are in Alexandria. The station was opened on June 15, 1991, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Providing service for the Blue Line, the station is located at South Van Dorn Street and Eisenhower Avenue, next to the Capital Beltway. From 1991 to 1997 it was the southwestern terminus of the Blue Line.

New Carrollton station is a joint Washington Metro, MARC, and Amtrak station just outside the city limits of New Carrollton, Prince George's County, Maryland located at the eastern end of the Metro's Orange Line. The station will also serve as the eastern terminus of the Purple Line, currently under construction, and is adjacent to the Capital Beltway.

Braddock Road is an island-platformed Washington Metro station in Alexandria, Virginia, United States. The station was opened on December 17, 1983, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). Providing service for both the Blue and Yellow Lines, the station is located at Braddock Road and West Street.

Downtown Largo is an island-platformed Washington Metro station in Lake Arbor census-designated place, unincorporated Prince George's County, Maryland, United States, with a Largo postal address.

The George Washington Masonic National Memorial is a Masonic building and memorial located in Alexandria, Virginia, outside Washington, D.C. It is dedicated to the memory of George Washington, the first President of the United States and a Mason. The tower is fashioned after the ancient Lighthouse of Alexandria in Egypt. The 333-foot (101 m) tall memorial sits atop Shooter's Hill at 101 Callahan Drive. Construction began in 1922, the building was dedicated in 1932, and the interior finally completed in 1970. In July 2015, it was designated a National Historic Landmark for its architecture, and as one of the largest-scale private memorials to honor Washington.

The National Science Foundation (NSF) is an independent agency of the United States government that supports fundamental research and education in all the non-medical fields of science and engineering. Its medical counterpart is the National Institutes of Health. With an annual budget of about $8.3 billion, the NSF funds approximately 25% of all federally supported basic research conducted by the United States' colleges and universities. In some fields, such as mathematics, computer science, economics, and the social sciences, the NSF is the major source of federal backing.

The United States Patent and Trademark Office (USPTO) is an agency in the U.S. Department of Commerce that serves as the national patent office and trademark registration authority for the United States. The USPTO's headquarters are in Alexandria, Virginia, after a 2005 move from the Crystal City area of neighboring Arlington, Virginia.