Duolingo is usually focused on teaching languages that are immediately relevant, even if they're only useful at sci-fi conventions. This, however, isn't one of them. The service has introduced a Classical Latin course that, with the help of the Paideia Institute, will help you learn a language that hasn't been commonly used for centuries -- it's not even the Ecclesiastical Latin still used in churches. The learning process works much like it does in other Duolingo courses, although Latin's complexity could pose a serious challenge. It'll be a while before you're translating ancient murals.