Its very ruin and decay makes it only more precious to the traveller. There are here none of the modern and commonplace evidences of life and activity that shock the artistic sense in other towns. All is old, moribund, and picturesque. It lies here in the heart of the Guadarramas, lost and forgotten by the civilization of the age, muttering in its senile dream of the glories of an older world. It has not vitality enough to attract a railroad, and so is only reached by a long and tiresome journey by diligence. Its solitude is rarely intruded upon by the impertinent curious, and the red back of Murray is a rare apparition in its winding streets. Yet those who come are richly repaid. One does not quickly forget the impression produced by the first view of the vast aqueduct, as you drive into the town from La Granja. It comes upon you in an instant,--the two great ranges of superimposed arches, over one hundred feet high, spanning the ravine-like suburb from the outer hills to the Alcazar. You raise your eyes from the market-place, with its dickering crowd, from the old and squalid houses clustered like shot rubbish at the foot of the chasm, to this grand and soaring wonder of utilitarian architecture, with something of a fancy that it was never made, that it has stood there since the morning of the world. It has the lightness and the strength, the absence of ornament and the essential beauty, the vastness and the perfection, of a work of nature. It is one of those gigantic works of Trajan, so common in that magnificent age that Roman authors do not allude to it. It was built to bring the cool mountain water of the Sierra Fonfria a distance of nine miles through the hills, the gulches, and the pine forests of Valsain, and over the open plain to the thirsty city of Segovia. The aqueduct proper runs from the old tower of Caseron three thousand feet to the reservoir where the water deposits its sand and sediment, and thence begins the series of one hundred and nineteen arches, which traverse three thousand feet more and pass the valley, the arrabal, and reach the citadel. It is composed of great blocks of granite, so perfectly framed and fitted that not a particle of mortar or cement is employed in the construction. The wonder of the work is not so much in its vastness or its beauty as in its tremendous solidity and duration. A portion of it had been cut away by barbarous armies during the fifteenth century, and in the reign of Isabella the Catholic the monk-architect of the Parral, Juan Escovedo, the greatest builder of his day in Spain, repaired it. These repairs have themselves twice needed repairing since then. Marshal Ney, when he came to this portion of the monument, exclaimed, "Here begins the work of men's hands."