For him the tour of the renowned fortifications will be the great event of his visit. Having furnished himself with the necessary authorization from the proper military authorities (for he will be reminded at every turn of the strict martial discipline under which he lives), he will proceed to ascend the Rock, making his first halt at a building which in all probability he will often before this have gazed upon and wondered at from below. This is the Moorish Castle, the first object to catch the eye of the newcomer as he steps ashore at the Mole, and looks up at the houses that clamber up the western slope of the Rock. Their ascending tiers are dominated by this battlemented pile, and it is from the level on which it stands that one enters the famous galleries of Gibraltar. The castle is one of the oldest Moorish buildings in Spain, the Arabic legend over the south gate recording it to have been built in 725 by Abu-Abul-Hajez. Its principal tower, the Torre del Homenaje, is riddled with shot marks, the scars left behind it by the ever-memorable siege. The galleries, which are tunneled in tiers along the north front of the Rock, are from two to three miles in extent. At one extremity they widen out into the spacious crypt known as the Hall of St. George, in which Nelson was feasted. No arches support these galleries; they are simply hewn from the solid rock, and pierced every dozen yards or so by port-holes, through each of which the black muzzle of a gun looks forth upon the Spanish mainland. They front the north, these grim watchdogs, and seeing that the plain lies hundreds of feet beneath them, and with that altitude of sheer rock face between them and it, they may perhaps be admitted to represent what a witty Frenchman has called _le luxe et la coquetterie d' imprenable_, or as we might put it, a "refinement on the impregnable." Artillery in position implies the possibility of regular siege operations, followed perhaps by an assault from the quarter which the guns command; but though the Spanish threw up elaborate works on the neutral ground in the second year of the great siege, neither then nor at any other time has an assault on the Rock from its northern side been contemplated. Yet it has once been "surprised" from its eastern side, which looks almost equally inaccessible; and farther on in his tour of exploration, the visitor will come upon traces of that unprecedented and unimitated exploit. After having duly inspected the galleries, he will ascend to the Signal Tower, known in Spanish days as El Hacho, or the Torch, the spot at which beacon fires were wont on occasion to be kindled. It is not quite the highest point of the Rock, but the view from it is one of the most imposing in the world. To the north lie the mountains of Ronda, and to the far east the Sierra of the Snows that looks down on Granada, gleams pale and spectral on the horizon. Far beneath you lie town and bay, the batteries with their tiny ordnance, and