The Roman amphitheatre is about a 15-minute walk down from the Musée de Carthage. Once one of the largest in the Roman Empire, with a capacity for 36,000, today only the neat overgrown oval of the stage remains. It's an evocative place, with a sinister exposed subterranean passage where once the theatre's victims cowered. Contrary to legend, St Perpetua and St Felicity were not martyred here, but probably at a military camp outside Carthage.