Sometime around 3500 B.C.E. men not yet identified had built the thick outer wall by throwing together huge stones in haphazard piles. Two thousand years later, well before the age of Saul and Solomon, some other unidentified group had built the sturdy middle wall. And two thousand five hundred years after that, at the time of the Crusaders, the inner wall had been erected, and it was a European masterpiece.
