What's happened to shopping malls/big box stores in this fallen world? Have they been reused for various purposes or have they all been abandoned? On a similar note, what's happened to the various mothballed ships lining the coasts of America? In particular, the four aircraft carriers moored in the Puget Sound Shipyard. Is the waters shallow enough that they'd simply settle on the bottom? Because I want a medieval Rivet City so badly.