References to the foundations, to the thresholds, to the gates and doorways, and to bulls and upright serpents, as the guardians of the threshold of the temples and palaces of Babylonia and Assyria, are numerous on unearthed cylinders and tablets, and always in such a way as to indicate their peculiar sacredness. In the recent unearthing, at Nippur, of a small building or shrine, between two great temples, an altar was found in the eastern doorway. It is to be borne in mind that many early temples in Babylonia, as in Mesopotamia, in Egypt, in Mexico, Central America, and Peru, and in the South Sea Islands, were in the form of a stepped pyramid, or a staged tower, with either inclined planes or stairways from each lower stage to the next higher, and with an altar, or a sanctuary or shrine, at the summit.[317] Herodotus, describing one of these temples in Babylon, says that the altars, larger and smaller, were outside the temple.[318] Light is thrown on the dream of Jacob at Bethel by the shape of the ancient temple in the East. In his vision it was probably not a ladder, but a conventional stepped-temple structure, with its stairways rising heavenward, and its sanctuary, that Jacob saw.[319] The angel ministers were passing up and down the steps, in the service of the Most High God, who himself appeared above the structure. When Jacob waked he said: “Surely the Lord is in this place [or sanctuary]; and I knew it not.... How dreadful is this place! this is none other but the house of God, and this is the gate of heaven;” and he took the stone which had been his pillow at the threshold of that sanctuary, and set it up for an altar pillar.[320] In the literature and legends of Babylonia, as of other portions of the ancient world, there is prominent the idea that an entrance into the life beyond this, as in the entrance into this life, the crossing of a threshold from the one world to the other, from the earlier state and the passing of a door, or gate, marks the change to the later, from the sacred to the more sacred. This is peculiarly illustrated in the famous legend of Ishtar’s descent into the under-world in order to bring back to earth her lover Dumuzi.