where is pentangon

The Pentagon is the headquarters of the United States Department of Defense, located at 48 N. Rotary Road, Arlington, Virginia 22211 (Map). Its mailing address is "Washington, DC 20301." As a symbol of the US military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself. Those who work within its walls often simply call it the Building.[citation needed]The building was dedicated on January 15, 1943. It is the highest-capacity office building in the world and one of the world's largest buildings in terms of floor area. It houses approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel. It has five sides, five floors above ground (plus two basement levels), and five ring corridors per floor with a total of 17.5 miles (28 km) of corridors. At five acres (20,000 m²), the central plaza in the Pentagon is the world's largest "no-salute, no-cover" area (an area exempt from the normal rule that, when out of doors, U.S. military personnel must wear hats and salute superior officers). The open space in the center is informally known as "ground zero," a nickname originating during the Cold War when it was thought of as the most likely target of a nuclear missile. At the center of this plaza is the "Ground Zero Cafe," a snack bar. Just south of the Pentagon are Pentagon City and Crystal City, extensive shopping and high-density residential districts in Arlington. Arlington National Cemetery is to the north. The Washington Metro Pentagon station is also located at the Pentagon, on the Blue and Yellow Lines. Source: http://www.answers.com/topic/the-pentagon