Artillery Drill at Presidio San Francisco, California
The Presidio in San Francisco, California, is a historic military base strategically located at the tip of the peninsula.
It is located directly at the Golden Gate, the entrance to the Bay of San Francisco and is the longest used military base in the United States.
The presidio has been used successively by the Spanish Armed Forces, the Mexican Military and the United States Armed Forces since its foundation by the Spanish in 1776 to 1994.
The site, which measures two by three kilometer in size, houses 870 buildings, of which around 470 are considered historically significant. The Presidio was designated a National Historic Landmark District in 1962 and has been administered by the National Park Service as part of the Golden Gate National Recreation Area since October 1,1994.