The Pentagon The Pentagon The Pentagon, in Arlington County, Virginia, across the Potomac River from Washington, D.C., is the headquarters of the United States Department of Defense. 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 September 11, 1941, and the building was dedicated on January 15, 1943. General Brehon Somervell provided the major motivating power behind the project; Colonel Leslie Groves was responsible for overseeing the
Arlington County, Virginia completed in 2009. At the time of completion, the Turnberry Tower was tallest residential building in the Washington metropolitan area. In 2017, Nestle USA chose 1812 N Moore in Rosslyn as their US headquarters. In 2018, Amazon.com, Inc. announced that it would be splitting its "HQ2" second headquarters project between Arlington and Long Island City, New York. The Arlington HQ2 site is planned for the Crystal City neighborhood, anchoring a broader area of Arlington and the City of Alexandria that was simultaneously rebranded as National Landing. Arlington County is located in northeast Virginia and is surrounded by Fairfax County and