At the fourth milestone from the Porta Capena, the Latin road passed under the arches of the Claudian and Marcian aqueducts, at the tower now called Torre Fiscale. At this point the two aqueducts cross each other, and present a most magnificent series of arcades running along the side of the old Latin road for more than a mile. The arches of the Claudian aqueduct are here more than fifty feet in height. The railway to Naples runs very close to the line of the old Latin road here. A great number of ruins are still to be seen at a place called Sette Bassi, four miles and a half from the Porta S. Giovanni and near the Osteria del Curato. This spot, as well as the district near it on the Appian road, bears the name of Roma Vecchia. The scattered ruins occupy a space of nearly three-quarters of a mile in circumference, and appear to have been built at two different epochs. The bricks of which one portion of them is constructed have the dates A.D. 123 and 134 upon them, the years when Pœtinus and Africanus and Servianus and Juventius were consuls. The other part of the building is evidently contemporaneous with the ruins on the Appian road and belongs to the Antonine era. All the bricks were made at one of the imperial kilns, and it has therefore been generally supposed that the villa was an imperial residence, forming a part of the already-mentioned Suburbanum Commodi. The marbles found on the spot show that it was decorated with great magnificence, and a particular kind of breccia, numerous fragments of which have been picked up there, obtains its name, Breccia di Sette Bassi from the place. The plan, according to Nibby, was that of a large oblong area, the longer sides of which ran north and south. In the centre there was room for a large pleasure garden. The front of the buildings was at the northern end towards Rome, and the remains of a portico can be traced, which supported a terrace on a level with the first floor rooms of the mansion. One of these rooms with three doors and the same number of windows can still be traced. In some of the walls the remains may be seen of terra-cotta pipes for heating the rooms. The ground floor apartments were without decorations, and are therefore supposed to have served as storehouses for grain and farm produce.[144] [Illustration: Circus of Maxentius, with Torre Fiscale beyond it and the hills above Præneste and Tusculum.] Behind this front building, on the eastern and western sides, are long ranges of building, the eastern consisting of two suites of rooms, probably intended for baths or for gymnasia, and the western forming a long ambulacrum terminated by an exedra. On the south side there is a cryptoporticus and a reservoir for water which was supplied by a branch of the Claudian aqueduct.