It’s a stereotype that people from the US only know one language. I know that there are several areas of the world where it is typical for individual people to fluently speak several languages.
Where in the world is it common for people to speak large numbers of languages fairly well? I’m talking about having lots of very multilingual people, rather than talking about areas where lots of languages are spoken, but the common person might only know one or two, such as NYC. For example, while Yiddish and Spanish appear to be spoken in NYC, they are typically spoken by different demographics as a primary language and so the number of NYC residents that speak both fluently or fairly well is probably fairly low, though I expect that the number of bilingual English/<other language> speakers is very high. E.g. there are probably lots of English/Spanish bilinguals and lots of English/Yiddish bilinguals, but few English/Spanish/Yiddish trilinguals.
Are there places in the world where you can expect the common person on the street to speak three languages fluently or, if not fluently, rather well? What about four languages? Five?
For example, can I land somewhere in Eastern Europe where the guy behind the lunch counter probably speaks fluent Polish, Russian, German, and English?