You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
As the title asks find a way to preserve Latin as a spoken language until today. It does not have to actually be Latin, but must have a clear line of descent with the language spoken by the Romans. Also it does not have to be spoken by very many people. A few hundred thousand will suffice.
I would think that an isolated area without alot of outside influence would be best.