In an economic collapse or communist take over, old WW2 bunkers and facilities are great initial retreat areas and a decent loot stash. With some minor repairs and upgrades and some new locks there are few locations more suited for a temporal or even long term survival. Military bunkers are perfect for a staging area for expeditions into towns or cities. Well concealed, easy to defend and extremely strong structurally. Some you may find could have miles of underground tunnel networks. I have scouted out a few great locations in my area, some with intact rain water catchments tanks, observation towers, gun nests, living quarters and so on. The picture attached is a facility designed to withstand japanese artillery assault featuring fortified AA and machine gun nests perfect for defending against any small arms attack or raid. Plus it's I find it fun to explore old disused tunnels and bunkers.