Courtesy Benjamin Mazar, Archaeological Expedition of the Hebrew University and the Israel Exploration Society near the Temple Mount

Prior to the Temple Mount excavations, Robinson’s Arch, the spring of an arch protruding from the sunlit edge of the western wall below the minaret, was thought to support a bridge across the valley to the Upper City on the west. The absence of further piers to the west and the discovery of piers of descending size to the south, indicated that Robinson’s Arch actually supported a staircase from the Temple Mount down to the street in the valley.