Monte dei Paschi di Siena

This Naples branch of Monte dei Paschi di Siena is part of the world's oldest surviving bank, founded in Tuscany back in 1472 — so you're literally doing your banking with a medieval institution. You'll find them on Via Crispi in the Chiaia neighborhood, handling standard banking, ATM access, and financial services. It's nothing flashy, but knowing you're interacting with over 550 years of banking history gives it a certain weight.