An old Fallout Shelter sign next to the marble-columned entrance of a Willett Street apartment building.
I don't recall the last time I saw one of these Cold War relics, though they were much more common in my childhood. I still remember the drills we had in grade school...filing into double-line against the walls of that long, dim hall at Vincentian Institute. At the time, though, I wasn't quite old enough to connect those drills with signs like this and the Cold War was already in its final stages.