Overlooking the remains of a Roman amphitheatre that once seated up to 10,000 spectators, this museum in a 14th-century convent has a sizeable collection of Etruscan and Roman artefacts, the highlights of which are the Cratere di Euphronios, a large 6th- century-BC Etruscan vase decorated with vivid scenes showing Hercules in battle, and an exquisite tiny portrait of a bearded man executed on glass in the 3rd century AD. You'll find the vase on the ground floor and the portrait upstairs.