On our trip this weekend in San Francisco I hunted down the inconspicuous grave of Sarah A. Bowman, also known as "The Great Northern."
This lady was a legend in her own time, a big woman (reportedly at least 6 feet tall) who was a fascinating character in US history - running brothels, nursing soldiers, and being a war hero.
I discovered a few months back she was buried in the Presidio in SF and made a point to find her grave.
A little about her:
http://en.wikipedia.org/wiki/Sarah_A._Bowman