slgwv's photos with the keyword: fortifications

At the Presidio in San Francisco, an important coastal fortification for something like a century, and now a historical site. These emplacements date from ca. 1890s. For more on the Presidio see the enclosing photo.

At the Presidio, San Francisco, an important coastal fortification for around a century. For more about The Presidio see the enclosing photo.