Ctesias tells us that Semiramis built a splendid palace at Ecbatana, a city lying in a plain, and as there were no springs near, she cut through the roots of the range of mountains, twelve stades distant from the city (the Orontes), on the farther side of which was a lake flowing into a river, in order to convey the water of the river into the city. For this object a tunnel was cut through the mountain, fifteen feet in breadth and forty feet in depth, and through it the river was carried into Ecbatana.[493] If Ctesias ascribes the palace of Ecbatana and the tunnel, like other monuments of Media, to Semiramis, we have already seen that the queen is no more than a poetical fiction; nor could any of the sovereigns who ruled over Assyria entertain the project of building citadels and conduits for the Median kings. These could only be the work of Median princes, who resided in Ecbatana; and as Phraortes could hardly have had the means and the time for such important structures, we must ascribe both the completion and adornment of the royal citadel, as well as the tunnel, to Cyaxares, unless we are to reject the latter as a pure invention, for which there seems to me no sufficient proof. "When the palace had been built at Ecbatana, it was surrounded with large and strong walls," Herodotus tells us, "of which one encircled another, in such a manner that the inner overtopped the outer by the height of the turret. The situation, which was on a hill, contributed to this result, and the natural elevation was artificially increased. In all there were seven circles; the innermost contained the king's dwelling and treasure-house; the outermost wall was of about the extent of the wall of Athens. The towers of the first circle were white, of the second black, of the third red-purple, of the fourth blue-purple, of the fifth red; the towers of the sixth are covered with silver; and those of the seventh, which surrounds the buildings of the palace, with gold. The city was built round the outermost wall."[494] Polybius describes the situation of Ecbatana and the palace as they were under the Achæmenids, who were wont to pass some of the hot summer months in the cool and fresh air of Ecbatana. "Ecbatana lies in the northern regions of Media, and commands the parts of Asia which look towards the Maeotis and the Euxine. The city was in old days the royal abode of the Median kings, and it appears to have far surpassed all other cities in wealth and in the splendour of its buildings. It is built under the spurs of the Orontes. Though without walls, it possesses a citadel built by the hand of man, of surprising strength. Below the citadel is the palace, which it is as difficult to speak of in detail as to pass over in silence. Ecbatana is an excellent theme for those who love to tell of marvellous things with adornment and exaggeration; but those who enter with caution on anything which goes beyond the ordinary intelligence find themselves in difficulties.