The northeast corner. Ritmeyer believes that all four corners of the Temple Mount survived the Roman onslaught of 70 A.D. The northeast corner is particularly important to his critique of Jacobson because, if Ritmeyer is right, the position of the northern wall is quite different from where Jacobson would place it. The colored areas in the drawing at left show still-extant remains. The northern face of the northeast corner, Ritmeyer argues, can be discerned even today, though it has been partially obscured by trees, later repairs and a city wall built in the Turkish period (see photograph). The visible remains show typical Herodian header-and-stretcher construction, in which the long and short sides of blocks of stone alternate. Two stretchers are visible at the bottom and in the second course from the top.