Abraham, Isaac, Jacob, Sarah, Rebecca, and Leah are all buried in Hebron at the cave of Macpelah, currently a Jewish historical site.Abraham sheltered under the tree at Mamre, very near the city of Hebron. Gen 18.. The Tree is protected, held up by an iron fence. According to Wikipedia, tradition says that when the tree dies, Anti-Christ will come.
It was thought to be dead in 1996, but later sprouted a small shoot. It sure looks dead. Notice the big "O" that surrounds the base. Hmmmmm
From Google Images........... a picture of the tree.... Genesis Chapter 18 -