Adjoining the Museo Archeologico, this once seated up to 10,000 spectators. Inside, there's a sizable collection of Etruscan and Roman artefacts, including locally produced ceramics and bronzes. Among the highlights is the Cratere di Euphronios, a large 6th-century-BC Etruscan vase, decorated with vivid scenes showing Hercules in battle, and, upstairs, an exquisite tiny portrait of a bearded man executed on glass in the 3rd century AD.
