I was thinking about old Jewish graves.
Certainly there's Ma'aras HaMachpeila in Chevron (was that continuously identified by Jews, or did our identification rely on Arabs' identification) and the like.
Moving much later, people can (and do) visit the graveyard in Safed, which contains the graves and tombstones of R' Yosef Karo and his colleagues, as they've been there for the past 400+ years.
But in between those: what are the oldest continuously-marked Jewish graves? I was told that several graves of Talmudic figures were re-identified by Arizal in the 1500s.