To the south-west of the Forum are the remains of three small temples, one dedicated to Venus, and a well-preserved Mithraeum, with mosaics representing the seven planets, &c. To the south-west again is the conspicuous brick cella of a lofty temple, on arched substructures, generally supposed to be that of Vulcan, with a threshold block of africano (Euboean) marble over 15 ft.
The town contains many ancient remains, notably the ruins of an ancient bridge in brickwork of twenty-one arches, of substructures in opus reticulation under the church of S.
In the south-east corner of the city are the picturesque ruins of the Roman imperial palace, and near the bridge are the extensive substructures of the 4thcentury Roman baths, 660 ft.
Pietro e Paolo and the adjoining houses are extensive substructures (in opus reticulatum and brickwork) of the 1st century A.D., belonging to a building erected by M.
There are two small towns, Capri (450 ft.) and Anacapri (980 ft.), which until the construction of a carriage road in 1874 were connected only by a flight of 784 steps (the substructures of which at least are ancient).
All these villas can be identified with more or less certainty, the best preserved being those on the east extremity, consisting of a large number of vaulted substructures and the foundations perhaps of a Pharos (lighthouse).
Here substructures of a large building or group of buildings have been exposed, which are perhaps part of the Serapeum.
It is supported by massive arched substructures, which extend under the surrounding houses.
It occupies the site of the ancient Adranon, which took its name from Adranos, a god probably of Phoenician origin, in Roman times identified with Vulcan, whose chief temple was situated here, and was guarded by a thousand huge gods; there are perhaps some substructures of this building still extant outside the town.
The Palazzo del Comune, with its lofty arched substructures at the back, was the work of Margaritone d'Arezzo, but has been since twice restored.
Gregorio is built into a Roman tetrastyle Corinthian temple, two columns of which and the cella are still preserved; the site of the Roman theatre can be distinguished; and the church and convent of the Annunziata (with two fine cloisters and a good fresco by Cola d'Amatrice in the refectory) are erected upon large Roman substructures of concrete, which must have supported some considerable building.
Julius Caesar possessed a villa here, the remains of which are probably to be recognized in some large substructures on the ridge above the 16th-century castle.
On these substructures were the huts composing the settlement; for the peculiarity of these lake dwellings is that they were pile villages, or clusters of huts occupying a common platform.
Of special interest was a huge bee-hive cavity under the southern porch into which the substructures of the palace had been sunk.
Among its great Greek buildings we hear only of the theatre, of which substructures still remain on the flank of Silpius, and of the royal palace, probably situated on the island.
The magnificent chancel (1349-1372), with the 14thcentury crypt below, rests on massive substructures, known as the Cavate.