Christian tradition holds that the place of the Last Supper is the Cenacle, on the second floor of a building on Mount Zion where David's Tomb is reportedly on the first floor. Biblical archaeologist Bargil Pixner claims to have found three walls of the original structure still extant today. The place of Jesus' anguished prayer and betrayal, Gethsemane, is probably somewhere near the Church of All Nations on the Mount of Olives. Jesus' trial before Pontius Pilate may have taken place at the Antonia Fortress, to the north of the Temple area. Popularly, the exterior pavement where the trial was conducted is beneath the Convent of the Sisters of Zion. Other Christians believe that Pilate tried Jesus at Herod's Palace on Mount Zion.