Beyond the Ponte Lucano to the right are the ruins of Hadrian’s great Tiburtine Villa. They occupy the slopes of a hill of volcanic tufa, which may be called an outlying part of Monte Affliano, extending for about three miles in a direction from south-east to north-west. The various levels afforded by the ground have been formed into terraces adapted to the buildings they were intended to support by means of substructions, which in some places are of vast solidity and gigantic height. “From these terraces,” says Nibby, “the views are most varied and picturesque. On one side the horizon is bounded by the pointed heights of the Montes Corniculani, and by the ridges of the Peschiatore, the Ripoli, and the Affliano, and on the other, the eye ranges over the gently undulating expanse of the Ager Romanus, from which rise the towers of the Eternal City; while beyond, the long streak of light reflected from the waters of the Etruscan and Laurentine Sea seems to encircle the whole with a silvery zone. The situation of the villa is open to the healthy breezes of the west wind, but is sheltered by the mountains from the fury of the north wind, the piercing chills of the north-east, and the unwholesome hot summer blasts of the south.” The high ground on which the villa stands rises between two valleys, which may be called from their position the north and south valleys. They run down into the plain through which the Anio cuts its bed. The northern valley has been artificially altered, with the view of increasing its picturesque appearance, by cutting the sides so as form perpendicular cliffs of reddish stone. The tints of these rocks, the soft verdure of the plants and trees which grow luxuriantly upon them, the bright colours of the wild flowers scattered here and there, and the lovely hills which rise as a screen behind them, give this valley such a character of soothing and enchanting retirement and beauty, that it has been universally regarded as the spot to which the name of the Vale of Tempe was given by the emperor. The southern valley is less deep and bold, and from its monotonous and severe aspect it may perhaps have been the spot where Hadrian placed his imitation of the infernal regions.[157]