Historical accounts of ancient cities, such as Babylon, Palmyra, and Nineveh of the Assyrians; Sidon, Tyre, Aradus, and Serepta of the Phoenicians; and Jerusalem, with its splendid temple, of the Israelites - show that architecture among them had made great advances. Ancient monuments of the art are found also among other nations; the subterraneous temples of the Hindoos upon the islands Elephanta and Salsetta; the ruins of Persepolis in Persia; pyramids, obelisks, temples, palaces, and sepulchres in Egypt - all prove that the architects of those early times were possessed of skill and judgment highly cultivated. The principal characteristics of their works are gigantic dimensions, immovable solidity, and, in some instances, harmonious splendor. The extraordinary size of some is illustrated in the pyramids of Egypt. The largest of these stands not far from the city of Cairo: its base, which is square, covers about 11 1/4 acres, and its height is nearly 500 feet. The stones of which it is built are immense - the smallest being full thirty feet long.