As of 2014, about 23,000 people work in the Pentagon. The staff at the Pentagon includes a combination of civilian and military personnel. The facility was completed in 1943 and was meant to be the hub from which the country managed issues related to World War II.
The fact that the Pentagon was built at a time when the nation was preparing for a major war heavily influenced its design. For instance, rather than using steel in its construction, most of the building is made out of reinforced concrete. When the Pentagon was built, there was a shortage of steel in most parts of the world. Most nations were using their steel reserves to manufacture arms, and the fact that the war was at hand meant that most other industries had to come to a halt.
The Pentagon is 5,100,000 square feet, and it has twice the office space of the Empire State Building. Despite the fact that the Pentagon hosts such a large number of people and is undoubtedly massive, most people can get from diametrically opposed points in a short amount of time. It takes an average of 10 minutes to walk across the Pentagon, according to History.com.