A lot of wealthy people have homes in Jackson Hole, Wyoming. A quick look at a map shows some reasons why. It's out in the middle of nowhere with national park all around it, and just a few roads which can be easily blocked. It has an airport so you can get there if you have your own plane. There's a lake for a secure water supply. The surrounding parks have wildlife for hunting. Etc, etc.
If SHTF, I don't want to be surrounded by concrete -- I want to be surrounded by well-armed friends, and be located far away from "inner city" zones.