I have my house in Megaton, but I also decided to take a small raider camp under a bridge as my own. It's near the Citadel, under the broken part of the bridge. Unfortunatley, I had forgotten about it and came back to raiders occupying it. The worst part is that I don't remember if I had stored anything there. It doesn't matter, I planted about 20 Frag Mines there this time so that the raiders would dye when they inevitably come back.