Hi Keith,
We had a look inside the one that was sitting at the top of Sharp Park Road back in the late 1970's (is this the San Bruno site you refer to?). Most of the buildings were still standing then, and could be wondered through. The railroad tracks that were welded across the hatch opening in the elevator room had been cut and we went down inside. The water was still working on the faucets, and I had the misfortune to slip and faul into a shallow pool of hydraulic fluid from the elevators. After hosing me down the best we could, I had to ride home in the back of my buddy's truck. In one of the control/blast rooms in the Nike bunker was a neat mural of SF back in the late 50/60's without all the skyscrapers. If you scroll down our website page there's a couple of pictures from the Marin base during it's operational days, they have tours there regularly:
http://www.sfahistory.org/meetings2005.htm
I presume you've been there by now, there was also a site up at Fort Funston in Daly City where the hang gliders fly from. Haven't been there in years, but most of it was/is paved over, and the gun emplacements have been sealed for safety reasons.
We also hiked through the areas you photographed, snuck into the bowels of Battery Hill 129 in the Marin headlands which lead to quite a few smaller gun emplacements and bunkers down the hill, and quite a few others in the area and down at the beachbelow 129.
I just grabbed a scrap book of horrible pictures I took back in the mid-70's with pictures of Batteries Wallace, Alexander, and Davis, to mention a few........
_________________
Roger Cain
www.sfahistory.org
http://groups.yahoo.com/group/Stearman/
We must limit politicians to two terms:
one in office and one in jail.