Researchers have found an isolated community on the coast of Turkey who speak a dialect of Greek very close to ancient Greek. Romeyka, a variety of Pontic Greek, has grammar and vocabulary that are otherwise only found in ancient forms of the language, but it has no alphabet.
The community of 5,000 is extremely insular, with unique customs and music, and rarely intermarries with outsiders.
Researchers do not know how the community got there or came to speak Romeyka. They may be the descendants of ancient colonists, or they may have been an indigenous tribe forced to learn the language.