It would seem that the chief pillar here, that of Baal, was of stone, because it was broken, whereas the other pillars must have been of wood, because they were burnt (v. 26).
A draught house.
A “latrine” or “toilet” (see Ezra 6:11; Dan. 2:5; 3:29). This was to show utter contempt for the place formerly employed as a sacred shrine.