Cosa was a city founded in 273 BC as a colony of Latin rights by the Romans.
The city stood not far from the Via Aurelia on the rocky promontory of Ansedonia, in the municipality of Orbetello, from which it dominated the Tyrrhenian coast towards Lazio. The hill, in its upper part, was formed by two peaks, an eastern and a southern other peak, separated by a broad saddle, as if to recall, in miniature, the Capitoline hill in Rome.
The name seems to derive from that of a nearby Etruscan cities, or Cusi Cosia, which was to be built close to the beach that is now called the venerable Lido in the nearby lagoon of Orbetello.
The National Archeological Museum of Cosa was built on top of the perimeter wall of a private house of the Roman era and was donated to the Italian people in 1981, the Marquise Sanfelice di Monforte.
Museo Archeologico Nazionale di Cosa
Via delle Ginestre, 35, 58015 Ansedonia, Orbetello GR
Open every day
Museo Archeologico Nazionale Antiquarium (the antiquarian) 9am-7pm
The Archeological area: 8am-8pm