In the suburbs to the north of Cape Linaro was the Roman town of Castrum Novum of which parts are visible in the sea and others have been recently excavated.

Numerous Roman bridges are preserved of the ancient Via Aurelia, the famous road linking Rome, coastal Etruria and Liguria, built from the 3rd century BC based on earlier Etruscan layouts.

The Ponte delle Vignacce (km 62.3) also with a single arch in sandstone ashlars is difficult to access today.

A large and luxurious seaside villa called Ulpiano was built near Castello Odescalchi, equipped with a port and fish farming facilities (peschiere), acquired perhaps at the beginning of the 3rd century AD by the famous jurist Ulpian, as shown by lead pipes (fistulae) with the inscription "Cn.

The presence of cryptoporticos, porticoes open towards the sea, baths with rich mosaic decorations and statuary is known, today dispersed in various museums and private collections.

The vast estate, equipped with a remarkable system for breeding fish and shellfish (peschiera) and a long pier, today almost completely submerged, was the subject of excavations and research in the last century.

Of wreck A, the best preserved, numerous strakes of planking joined with the tenon and mortise system and the keelbeam with the mast are visible.