National Geographic : 2016 Apr
103 1996 THE PRESIDIO SAN FRANCISCO, CALIFORNIA Sunset and low tide lure walkers to Marshall’s Beach. Strategically located at the entrance to San Francisco Bay, the park was a military outpost for 218 years, used first by Spain, then Mexico, and finally the United States. Unlike other parks in the national system, it receives no federal money. Most revenue comes from renting out former military buildings, many of which are classified as historic structures.