"Jewish history in China dates to at least the 8th century, when West Asian traders roamed the Silk Road. A Jewish settlement was established in the city of Kaifeng, in what is now Henan province, where a synagogue was built in 1163 and thousands of Jews worshiped openly. Kaifeng today boasts some Hebrew writing on tombstones, but no living link to its Jewish past (although some residents claim Jewish blood). By the 20th century, the community in Kaifeng was eclipsed by cities like Harbin, Ningbo and Tianjin, which all had sizable Jewish settlements."
In that “Quest” video above, Simcha (same guy as the Jesus Tomb, etc), with the help of a local guy who knows where people are (probably a gov’t agent), tracks down one of the Jewish residents of whatever city he’s in. The subject (who looks Chinese of course) tells him that the synagogue burned down 300 years earlier and that the congregation thereby lost its rabbi and eventually became non-practicing. Yet on his identity papers, he’s still identified as a Jew. Kinda cool.