The Civil War era fort was obsolete as soon as it was built, since rifled cannon penetrated brick walls, and the one threat it faced, the CSS Shenandoah via the Indian and Pacific, called off their mission when they learned the war had ended months earlier. (They spent their round the world voyage attacking whaling ships out of New Bedford, since they often had escaped slaves on their crews.) Before that, there was a Spanish fort here, which was taken over by the Mexicans and then by a band of Americans including Capt. Fremont and Kit Carson, shortly before California became a state.

These days, it’s best used as a place to get a nice photo of the Golden Gate Bridge (when it’s less foggy). The fort is open on weekends, and you can get a good photo from the roof. I walked down from Battery East, but walking or biking from Crissy Field is nicer. There is parking at the fort, although it requires persistence navigating, since more roads are open to bikes than cars around here.