The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. Pentagon is a symbol of United State military, was designed by George Bergstrom.Construction of the Pentagon began in September 1941 and took sixteen months to complete. Pentagon is the largerst office building in the world by surface with 604,000 m2 and 344,000 m2 are used by office. On 11 September , 2001, American Airlines Flight 77 was crashed into the western side of the Pentagon, killing 189 people.

Pentagon in numbers :
31 stairs
13 elevators
7754 windows
284 toilets
4200 clocks
17.5 miles of corridor
200000 telephone calls per day

Autor: Mikołaj Kiełbasiewicz