At Serabit the caves with their porticoes had evolved by the addition of chambers, etc., into a complicated series sacred to the representative goddess of the district and to the god of the Egyptian miners. It is estimated that the cult continued for at least a thousand years. In the neighbourhood of Petra several apparent 'high-places' have been found. They are perched conspicuously to catch the rays of the morning {20} sun or in view of a holy shrine; and the finest of them is approached by two great pillars, 21 to 22 feet high. Although as a whole they may be ascribed to 300 B.C.-100 A.D., their altars, basins, courts, etc., probably permit us to understand the more imperfect remains of sanctuaries elsewhere.[1] But independently of these, from Sinai to North Syria an imposing amount of evidence survives in varying forms for the history of the sacred sites of antiquity. In the rock-altars of the modern land with cup-marks and occasionally with steps, with the shrine of some holy saint and an equally holy tree, sometimes also with a mysterious cave, we may see living examples of the more undeveloped sanctuaries. For a result of continued evolution, on the other hand, perhaps nothing could be more impressive than the Sakhra of the Holy Temple at Jerusalem, where, amid the associations of three thousand years of history, the bare rock, with hollows, cavities, channels, and subterranean cave, preserves the primitive features without any essential change.[2] [1] G. Dalman, _Petra und seine Felsheiligtümer_ (Leipzig, 1908). [2] R. Kittel, Studien zur Hebräischen Archäologie und Religionsgeschichte (Leipzig, 1908), chap. i. Chap. ii. illustrates primitive rock-altars of Palestine and their development.