But where is the Rome of the Caesars, that great, imperial, and invincible city, that during thirteen centuries ruled the world? If you would see her, you must seek for her in the grave. You are standing, I have supposed, on the tower of the Capitol, with your face towards the north, gazing down on the flat expanse of red roofs, bristling with towers, columns, and domes, that covers the plain at your feet. Turn now to the south. There is the seat of her that once was mistress of the world. There are the Seven Hills. They are furrowed, tossed, cleft; and no wonder. The wars, revolutions, and turmoils of two thousand years have rolled their angry surges over them; but now the strife is at an end; and the calm that has succeeded is deep as that of the grave. These hills, all unconscious of the past, form a scene of silent and mournful beauty, with fragments of temples protruding through their soil, and humble plants and lowly weeds covering their surface. The topography of these famous hills it is not difficult to understand. If you make the Capitoline in which you stand the centre one, the remaining six are ranged round it in a semi-circle. They are low broad swellings or mounts, of from one to two miles in circumference. We shall take them as they come, beginning at the west, and coming round to the north. First comes the AVENTINE. It rises steep and rocky, with the Tiber washing its north-western base. It is covered with the vines and herbs of neglected gardens, amid which rises a solitary convent and a few shapeless ruins. At its southern base are the baths of Caracalla, which, next to the Coliseum, are the greatest ruin in Rome.