As the main focus of the 135-acre Semper Fidelis Memorial Park, The National Museum of the Marine Corps, just outside of Washington D.C., opened in 2006 to coincide with the Marine Corps’ 231st anniversary. The primary building of the Marine Corps Heritage Center contains 120,000 square feet of museum gallery space, an orientation theater, office space, gift shop, and two restaurants, all welcoming visitors to explore the history and values of the Corps.