Quiz: Inside the Pentagon Test your knowledge of the headquarters of the Defense Department. By Debra Bell June 4, 2010 | 12:24 p.m. EDT + More On what date was ground broken for construction of the Pentagon? Jan. 1, 1897 April 4, 1918 Sept. 11, 1941 Nov. 17, 1961 About how many miles of corridor are there inside the Pentagon? 2.5 6 12 17.5 Approximately how many square feet of office space is inside the Pentagon? 1.2 million 3.7 million 8.4 million 14.8 million True or false: Six different ZIP codes are currently assigned to the Pentagon by the U.S. Postal Service. True False About how many employees work inside the Pentagon? 25,000 50,000 100,000 200,000 Why was the Pentagon built with twice the needed number of bathrooms? Half were actually secret bunkers disguised as bathrooms The top brass demanded their own private facilities Extra bathrooms were needed to abide by segregation laws A mistake by the builders and the architect True or false: The Pentagon Memorial contains 184 statues representing victims of the September 11 terrorist attacks. True False What location within the Pentagon was allegedly targeted during the Cold War by the Soviets, who thought it was a secret meeting place or bunker? The gym The post office The barbershop The hot dog stand Which of these landmarks is closest geographically to the Pentagon? Arlington National Cemetery The Washington Monument The Lincoln Memorial The National Cathedral Click here for the answers.