Kaaba or Caaba, kah'ba, the sacred shrine at Mecca to which Moslems make their pilgrimages. It is a flat-roofed quadrangular structure about 40 feet high, 55 feet long and 45 feet broad, and stands in the center of the mosque, or sacred area, which is inclosed by walls and colonnades. At the southeast corner of the Kaaba, built into the wall, is the famous "black-stone," or Keblah, which is devoutly kissed by the pilgrim and is the point to which every pious Moslem directs his face in prayer.