From the comments, it seems there are bunkers designed for the masses in many European countries, but none in the USA. There has to be at least one, right?
Not sure about "many" European countries. Switzerland is certainly the only one who went to extremes on it. "None" is the wrong answer for the US as well (but the number might be approaching it). In the 50's and 60's the Civil Defense group published books on how to convert a basement into a shelter, or dig one in the back yard. Faced with the immense cost of building community shelters, they instead went about ident…
The approach to this in Manhattan in NYC was beyond farcical. Yes there were shelter signs at various buildings. Presumably their basements would be able to hold a few hundred people each. But consider:
1) what would an H-bomb or two do to Manhattan?
2) if alive, how do several million people survive in Manhattan if there is no water supply?
3) even if there is water, for how long will a few cases of moldy food feed them?
4) what about waste and hygiene? That many people will produce a lot of poop. Does it all stay in the basements if the sewage system isn't functional?
5) etc. As I said, the situation couldn't have been more absurd if it was deliberately written to be a farce. Manhattan wasn't the place to be hunkered down during a nuclear war. The movie Escape From New York depicted a Utopia when compared to what reality would have been.
Thankfully we never had to use any of those shelters during a real war.