Whatever your flavor of apocalypse may be, it’s always a good idea to remind yourself that it might happen, so you really should ask yourself, “What am I going to do?” Naturally, in the case that humanity brings upon its own destruction, it’s quite likely that the Internet won’t exist, but that doesn’t mean it can’t prepare you while it’s still here!
Get ready to grab your rad-suit, crank up the chain-saw, or check the batteries of your Geiger counter. MakeUseOf is venturing out into the wastelands with these three sites.
Go there now (scroll down to third section for Urban Explorers)

"take nothing but photographs,
leave nothing but footprints"