State Department Headquarters, District of Columbia

The headquarters of the State Department is in the Harry S. Truman Building, in the Foggy Bottom neighborhood of DC. State is the part of the federal government responsible for carrying out foreign policy and international relations. The headquarters building has around 1.4 million square feet. The building was built to house the War Office, but by the time it opened, in 1941, that department had already outgrown it, and instead funds were made available to build the Pentagon, the largest office building in the world, for the War Department, and the Department of State moved into the War Department building, which was still called the War Department Building for many years. It was expanded in the 1960s, and named after Truman in 2000.