The Pentagon is the world’s largest office building. It is located in Arlington, Virginia, it is home to the U.S. Department of Defence. The 6.6 million square foot structure covers 34 acres and has 16 parking lots. Around 23,000 military and civilian employees work in the five-sided building; each side is 921 feet long. The 5-storeyed building has 17.5 miles of corridors. The central five-acre pentagonal plaza is nicknamed “ground zero” on the presumption that it would be a prime target in a nuclear war. The Pentagon has six postal codes; the Secretary of Defence, the Joint Chiefs of Staff, and the four service branches each have their own code.
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