The pesukim (Bereishit Perek 23 Pesukim 17-19) summarize the negotiations between Avaraham Aveinu and the Hittites for the purchase of Me’arat HaMachpela and its field, which was the first land purchased in Eretz Yisrael by our Forefathers.
The walls around the complex were built more than 2000 years ago, apparently by King Herod. The actual cave is beneath the floor level. There is an entrance to the cave within Ohel Yitzchak, but it is not open, and very few people have actually seen the cave.
