The Pentagon
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The Pentagon is the headquarters 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 accelerate
A view of the Pentagon from above the Potomac River in 2018
A view of the Pentagon from the south in September 2007
The main Navy Building (foreground) and the Munitions Building were temporary structures built during World War I on the National Mall. The Department of War was headquartered in the Munitions Building for several years before moving into the Pentagon.
The Hall of Heroes on the Pentagon's main concourse
Leslie Groves
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Leslie Richard Groves Jr. was a United States Army Corps of Engineers officer who oversaw the construction of the Pentagon and directed the Manhattan Project, the top secret research program that deve
The Pentagon
…building was dedicated on 15 January 1943. General Brehon Somervell provided the major impetus to gain Congressional approval for the project. 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…
Groves in 1948
Northwest exposure showing construction of the Pentagon, 1 July 1942
Groves ran the Manhattan Project from the fifth floor of the New War Department Building.
Groves (left) and Robert Oppenheimer