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There's a command post on the top of this bunker.
Typically a sighting instrument is placed on that central pillar.
Today the eucalyptus trees have grown in so tightly that you couldn't spot a cargo ship coming in the south channel at broad daylight.
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Photographs of the gun batteries in Fort Mason, San Francisco. photographs, photo, images, pictures, travel, tourism, San Francisco, Fort Mason, Golden Gate National Recreation Area GGNRA, gun battery, cannon battery, artillery battery, Bateria San Jose, history, historic, architecture, buildings, military base, army base, navy base