The Tomb or Cave of the Patriarchs is series of caves located in the Old City of Hebron. According to the Abrahamic religions, the cave and adjoining field were purchased by Abraham as a burial plot for his family (wikipedia). The caves are surrounded by a rectangular enclosure built during Second Temple times on a slope opposite Tel Hebron, on a site commonly identified with the Cave of Machpelah (Avi Offer in Stern et al, 1993). Avi Offer in Stern et al (1993) further notes

A variety of evidence indicates the presence of several shaft tombs, dating to the Middle Bronze Age I and perhaps also the Iron Age, beneath the [Tomb] and in its environs. The structure itself is undoubtedly from the Second Temple period, but its construction is unattested in the sources. It is commonly attributed to Herod the Great, although some scholars date it even earlier. Over the years the building has undergone various modifications and additions; it has served at different times as a church and as a mosque.

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