Caliph al-Ma'mun in the Great Pyramid - part 3
Here then, we have clear evidence that a movable entrance stone was fitted to the Great pyramid, and that the descending passage had been visited, perhaps many times, throughout recorded history. To gain entry to the pyramid, however, was still not easy. Unless there was a flight of steps cut into the now-missing casing blocks, a series of ladders would have to be erected against the side of the pyramid to reach the door.