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23 of 32 from A century of guarding SF from attack (photos)
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Ryan Salsig
Hidden in San Francisco's Presidio, just across the road from a major trailhead and parking spot, this is the World War II-era Army's Harbor Defense Command Post and Navy's Harbor Entrance Command Post. It is easy to see from the road--if you know it's there.
December 4, 2010 4:00 AM PST
Photo by: Daniel Terdiman/CNET
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