I recently became aware of a series of articles on communities that have been considered as 'lost tribes of Israel'. These articles, some written by Rabbi Marvin Tokayer, who spent several years in Japan, compare the customs, history and traditions of each of these cultures with Judaism.
Japan: a fascintaing comparison of Japanese and Jewish customs.
In the Ecuador article, Tokayer also writes about Argentina. He discusses claims about finds of ancient menorahs, about supposedly Hebrew-speaking natives who knew the Shema, ancient artifacts inscribed in Aramaic and more.
Food for thought.