Housed in an 18th-century papal barracks just inland from the port, the small Museo Archeologico Nazionale displays Etruscan and Roman finds from the surrounding Tyrrhenian coast and from the excavations within Civitavecchia itself. Highlights include a Roman copy of a portrait of Socrates, a marble Apollo, a Pheidias-school Athena, and a generous case of Etruscan and Roman gold jewellery.
The museum is modestly scaled — perhaps an hour at a relaxed pace — but well-curated and rarely crowded. Modest entrance fee; closed Mondays. A good rainy-day choice or a quick stop while waiting for a ferry.