Fort Point, aside from being a historical landmark, it is also an American Civil War museum.
Stacks of powder kegs for the cannons. I hope they are empty.
These were probably not the actual boxes from the 1860's, but in any case, they did not store bread as we know it but a cracker or biscuit called "hardtack". Made of flour, water, and salt, it was said to be hard as a rock and had to be dunked in liquid to soften. Nevertheless, it could last for years and was the staple food of Civil War soldiers. Click here for a history and recipe of hardtack. If you want a box of your own, click here.
With long corridors like the one above or below, a photographer can have some real fun here.