The site of ancient Alsium, an Etruscan and later Roman settlement, lies between Ladispoli and Palo Laziale along the Via Aurelia. The ruins are not spectacular — the site has been built over for centuries and only fragments of wall and an ancient road are visible — but it provides context for the deep history of this coastline. The ancient port of Alsium served Roman aristocrats who kept villas along this stretch of coast.
The location is less visited than the famous Etruscan sites at Cerveteri (Caere) but is part of the same cultural landscape.