Pentagon

Pentagon: "The Pentagon is a white five-sided building with five floors each made up of five concentric pentagons, separated by five interior courtyards with the fifth being a five-acre courtyard in the middle. It's 77.3 feet tall and 77 million cubic feet in volume, housing about 23,000 employees. It has 131 stairways and 13 elevators. It's covered by 7 acres of glass windows."