The Pentagon

The Pentagon
A view of The Pentagon from above the Potomac River in 2018
General information
Architectural styleClassical Revival, Modern, and Stripped Classicism
LocationRichmond Hwy./VA 110 at I-395, Arlington County, Virginia, U.S.
Coordinates38°52′15″N 77°03′18″W / 38.87083°N 77.05500°W / 38.87083; -77.05500
Construction started11 September 1941 (1941-09-11)
Completed15 January 1943 (1943-01-15)
Cost$83 million (equivalent to $1.33 billion in 2023)[1]
OwnerUnited States Department of Defense
Height
Roof77 ft (23 m)[2]
Dimensions
Other dimensionsSides:
  • 5 (1943-2001)
  • 4 (2001-2002)
  • 5 (2002-present)
Technical details
Floor count7 (2 underground)
Floor area6,636,360 sq ft (620,000 m2)
Design and construction
Architect(s)George Bergstrom
David J. Witmer
Main contractorJohn McShain, Inc.
Other information
Parking67 acres (27 ha)
Pentagon Office Building Complex
Map
NRHP reference No.89000932[3]
VLR No.000-0072
Significant dates
Added to NRHP27 July 1988
Designated VLR18 April 1989[4]

The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As a symbol of the U.S. military, the phrase The Pentagon is often used as a metonym for the Department of Defense and its leadership.

The building was designed by American architect George Bergstrom and built by contractor John McShain. Ground was broken on 11 September 1941, and the building was dedicated on 15 January 1943. General Brehon Somervell provided the major impetus to gain Congressional approval for the project;[5] Colonel Leslie Groves was responsible for overseeing the project for the U.S. Army Corps of Engineers, which supervised it.

The Pentagon is the world's second-largest office building, with about 6.5 million square feet (600,000 m2) of floor space, 3.7 million square feet (340,000 m2) of which are used as offices.[6][7] It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi (28.2 km)[7] of corridors, with a central five-acre (2.0 ha) pentagonal plaza. About 23,000 military and civilian employees work in the Pentagon, as well as about 3,000 non-defense support personnel.[7]

In 2001, the Pentagon was damaged during the September 11 attacks. Five Al-Qaeda hijackers flew American Airlines Flight 77 into the western side of the building, killing themselves and 184 other people, including 59 on the airplane and 125 in the Pentagon.[8] It was the first significant foreign attack on federal facilities in the capital area since the burning of Washington during the War of 1812.[9] Following the attacks, the western side of the building was repaired, with a small indoor memorial and chapel added at the point of impact. The coordinated attacks, which killed 2,977 people, were the deadliest terrorist attack in history.

In 2009, an outdoor memorial dedicated to the Pentagon victims of the September 11 attacks was opened.

  1. ^ Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved 30 November 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.
  2. ^ "Facts: Navigating The Pentagon". pentagontours.osd.mil. Archived from the original on 11 January 2018. Retrieved 10 January 2018.
  3. ^ "National Register Information System". National Register of Historic Places. National Park Service. 9 July 2010.
  4. ^ "Virginia Landmarks Register". Virginia Department of Historic Resources. Archived from the original on 21 September 2013. Retrieved 12 May 2013.
  5. ^ Vogel (2007), p. [page needed].
  6. ^ Hancock, Michaila (27 August 2015). "Pentagon: the world's largest office building - in infographics". The Architects' Journal. Archived from the original on 15 January 2021. Retrieved 27 February 2021.
  7. ^ a b c "The Pentagon, Facts & Figures". Archived from the original on 19 August 2014. Retrieved 23 August 2014.
  8. ^ Stone, Andrea (20 August 2002). "Military's aid and comfort ease 9/11 survivors' burden". USA TODAY. Archived from the original on 11 March 2015. Retrieved 12 September 2021.
  9. ^ "Bladensburg". American Battlefield Trust. Retrieved 3 November 2024.