Watch out for DCC at ATMs (Yes, now the banks are trying it!)
In Italy, Sicily, specifically, we were told that in order to exchange currency in either a bank or a cambio a passport was required. That is pure hearsay since I only use ATMs. I was on one occassion asked for a photo ID to support the use of a credit card for a purchase. I think I might have been able to talk my way out of that but it was easier to just produce the passport and go on my way.