Where can I can send a fax from Rome, Italy to the United States.
Ask your hotel, I'm sure if they can't help they will be able to say who can.
Your hotel or find a Western Union office (there are lots of them).
I have used an online fax service for years now. I mostly use it so that faxes I receive are converted to .PDF format and arrive by email, but I am fairly sure it will let you do outbound faxing from any computing device and send it to a fax machine. If you don't have what you want to fax in an electronic or scanned format, I think some services let you take a picture of it from your phone and fax the picture. You might check to see if you can achieve the same thing by sending an email with an attachment. Fax transmissions are getting to be a bit of an anachronism these days. Your recipient might have an easier way to get whatever it is you need to send.