The rather erratic excavations, which began already in the 18th C., led to the discovery of structures belonging to the Imperial Age such as a theatre, a curia, an archive, a few dwellings, a suburban street lined with sepulchres, a sacred altar dedicated to Apollo and a public aqueduct.

The remnants of wall structures in concrete, opus reticolatum and opus latericium, paving and drains, can be identified along the coast. The inscription documentation has informed us of the existence of decuriones (members of the colony senate), duumviri quinquennales (supreme town magistrates), Augustales (priests assigned to worshipping the emperor ), magistri vici (neighbourhood administrators).

The architectural and sculptural fragments that have been found include a herm of a veiled Aspasia, a small statue of Bacchus, a few statues of Emperors (Clodius Albinus; Lucius Verus) and, following its discovery in 1778, an interesting casket containing 122 gold coins, dated between the 1st and the 2nd C. AD.

Iron age materials (9th C. BC.) and of early Etruscan origin, provide evidence that the site was already populated before the period of Roman dominance and that the landing place of Castrum Novum was already active in Etruscan times.