It is in Babylon that we ought to have found the masterpieces of this architecture, in that capital of Nebuchadnezzar where the Chaldæan genius, just before it finally lost its autonomy, made the supreme effort that resulted in the buildings attributed by the travelled Greeks to their famous Semiramis. We have no reason to disbelieve Ctesias when he says that there were two palaces in Babylon, one on the left and another on the right bank of the Euphrates. “Semiramis,” says Diodorus, following his usual guide, “built a double residence for herself, close to the river and on both sides of the bridge, whence she might at one and the same time enjoy the view over the whole city, and, so to speak, keep the keys of the most important parts of the capital in her own power. As the Euphrates runs southward through Babylon, one of these palaces faced the rising, the other the setting, sun. Round the palace that faced westwards, she built a wall sixty stades in circumference, &c.”[35] The larger and more richly decorated of the two palaces was that on the left bank.[36] Its opposite neighbour has vanished and left no trace. The Euphrates has been gradually encroaching on its right bank ever since the days of antiquity, and has long ago disunited and carried away the last stones and bricks of the western palace. The eastern palace is on the other hand still represented by one of the great mounds that dominate the plain; this mound is called the Kasr, or castle (Fig. 183, vol. i.). Its circumference is now not far short of a mile.[37] Its form is that of an oblong parallelogram, with its longest side next the river and parallel to it. The flanks of the mound have, however, been so deeply seamed by searchers for treasure and building materials that no vestige of its arrangements is now to be traced. The bricks employed in the building all bore the name of Nebuchadnezzar.