The Antiquarium Arborense is Oristano's main museum, housed in a 19th-century palazzo just off the Piazza Roma. The collection spans the full arc of Sardinian prehistory and history: Nuragic bronzes, Phoenician pottery, Punic jewellery, Roman statuary, and an exceptional room of medieval altarpieces from the Arborean kingdom period.
The Nuragic section is particularly strong, with finds from the surrounding Campidano plain and the Sinis Peninsula that illustrate the sophistication of the Bronze Age civilisation that built the island's thousands of nuraghi towers. The Roman section includes a scale model of the ancient city of Tharros, which helps orient a visit to the ruins on the Sinis Peninsula.