No, I have never been in Naples but I have heard from my friends that pizza is cheaper in Naples compared to other regions of Italy. :P I don't know how much of that is true, but if that's true, it's a tourist attraction for sure. :P
Also, please remember that passato prossimo in Italian has two equivalents in English: simple past and present perfect.
Present perfect in today's English uses only "to have" as the auxiliary verb. Unlike Italian, you are never allowed to use "to be" as an auxiliary verb to indicate the perfect aspect of the main verb. In other words, "Are you ever been in Naples?" is wrong and you should instead say "Have you ever been in Naples?".