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.
The massive concrete substructures of the campanile are attributed to an old lighthouse.
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