We visit the graves of holy Jewish rabbis R" Yonatan ben Uzziel in Amuka and R" Shimon bar Yohai in Meron, who both lived in the times of the Roman occupation Judea during the 2nd century. We also take a dip in the mikvah (ritual bath) and visit the grave of the AriZal in Tzfat, who lived in that area in the mid 1500s.
R" Shimon was the author of the Zohar, the seminal book of Kabbalah, the mystical/esoteric secrets of the Torah. R" Yonatan ben Uzziel was one of the sages of the Talmud. It is said that he never married, to people come to his grave to beseech G-d to find their intended. The AriZal aka R" Isaac Luria is considered the father of contemporary Kabbalah.