This shot is fantastic. And thanks, Melanie, for the great link. It's sad that such a part of our history has been relegated to neglect. Would be great for further exploration though. Just imagine what you'd find inside!
that would be Lime Point, part of East Fort Baker, part of the "triangle of defense" at GG Bridge, the other two parts being Fort Point [south end of the bridge] and Alcatraz Island:
http://www.nps.gov/prsf/coast_defense/third_system/index.htm
