The Pageant of Mysteries
A modest-enough holding built around an isolated section of elevated freeway. They grow a few crops and keep a few livestock under the freeway and they live up top; the only way up is the guarded and fortified offramp. They’ve got guys with rifles and binoculars on hanging platforms, like what window washers used to use, watching the horizon for raiders or other threats. It’s not much, but they’ve made it work so far.