
Even in archaeologically well-plowed areas such as Italy, where written sources abound in ancient languages that (with the exception of Etruscan itself) are well understood — the future Roman emperor Claudius even wrote a history of the Etruscans and (he’s the last ancient person known to have been able to read it) a dictionary of the Etruscan language — significant discoveries remain to be made. Unless, of course, this happens to be the very last one, ever:
http://www.livescience.com/54262-religious-text-in-lost-etruscan-language.html