The museum is situated in the "Command Building" ("Palazzo del Comando"), built in 1764 at the request of Pope Clement XIII Rezzonico to house the commander of the piazza or "castellan" of the papal garrison (previously at Fort Michelangelo).

There are, in the great hall on the ground floor, introduced by panels devoted to Roman Civitavecchia and the Roman villas of the territory, some sculptures on exhibition, including a painting of Hermes, a philosophical portrait of Socrates, a head of a female divinity, the statue of a deified woman, a bust of Marcus Aurelius as a young man and another of Septimius Severus, two funeral reliefs with scenes of gladiators in combat, a beautiful statue of Apollo, a reworking of the famous example by Leochares, a replica of the statue of Athena Parthenos of Fidia (the head is in the Louvre), some sarcophagi.

The adjacent room holds a Lapidary, containing epigraphs from Centumcellae and Aquae Tauri, from the sites of Castrum Novum and Caere, a group of engravings of the sailors of the fleet of Miseno, from the burial ground in Prato del Turco, and another group of Etruscan and Latin epigraphs from Tarquinia, Gravisca and S. Marinella.

The wide corridor of the first floor, which can be reached by climbing a spiral staircase, houses ceramic and bronze objects from grave goods from different parts of the building and the area of Tolfa and Allumiere: the settlement and necropolis of Pisciarelli (VI-IV century B.C.); the protohistoric Villanovian settlements of Torre Valdaliga and La Frasca (IX-VIII century B.C.); sites in Torre Marangone (VIIVI century B.C.), Volpelle (VII-III century B.C.), La Castellina (VIII-VI century B.C.), La Pozza and Colle di Mezzo (VII century B.C.), as well as the inhabited area of Monte Rovello, of which a stratigraphic section has been reconstructed.

Galleria fotografica