I watched a movie from 1962, PANIC IN THE YEAR ZERO, starring Ray Milland aand Frankie Avalon. It was kind of cornball by today's standards, but I couldn't pull myself away. It was about an all-American family taking a fishing/nature trip in the mountains when Los Angeles and other cities around the world were destroyed in a nuclear attack. The movie dealt with the struggle for survival with people turning violent and selfish. I imagine it has a bit of a cult following.