15/01/2025
On This Day in History: Virginia Edition 📜✨January 15, 1943
The construction of the Pentagon in Arlington County is completed.
The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As a symbol of the U.S. military, the phrase The Pentagon is often used as a metonym for the Department of Defense and its leadership.
The Pentagon is the world's second-largest office building, with about 6.5 million square feet of floor space, 3.7 million square feet of which are used as offices. It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi of corridors, with a central five-acre pentagonal plaza. About 23,000 military and civilian employees work in the Pentagon, as well as about 3,000 non-defense support personnel.