The Pentagon is a national and international home for the American military and the Department of Defense. Currently listed as the largest office building in the world, the Pentagon employs 23,000 civilian government and military employees with an additional 3.000 non-government contractors.
With five floors above ground and two floors below ground, the Pentagon includes five rings on each level that equals about 17.5 miles of hallways and corridors identified as A, B, C, D, or E rings. The groundbreaking for the Pentagon was Sept 11, 1941. Sixty years later to the day, a part of the Pentagon was damaged when a highjacked American Airlines Flight 77 crashed into the west side of the building claiming the lives of 189 people.
Today, the Pentagon includes about 6.5 million square feet (150 acres) of floor space in which 3.7 million sq ft (85 acres) are used for offices and internal commercial, retail, religious space, and medical facilities to meet the needs of Pentagon employees. This five-sided iconic building is listed on the National Registry of Historic Place and as a National Historic Landmark.
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