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Fort Mason served as an Army post for more than 100 years, initially as a coastal defense site[3] and subsequently as a military port facility. During World War II, it was the principal port for the Pacific campaign.
Today it is part of the Golden Gate National Recreation Area and the site of several cultural facilities. It is a National Historic Landmark District with over 49 buildings of historic significance, spread over 1,200 acres (490 ha .
Fort Mason can be split into two distinct areas. The upper area, sometimes called Fort Mason, is situated on a headland and was the site of the original coastal fortifications. The lower area, Fort Mason Center, is situated close to water level to the west of Upper Fort Mason, and is the site of the former military port, with its piers and warehouses. The Marina Green lies to the west of Fort Mason, while Aquatic Park is to the east.