Scholars tend to think of the Pax Romana as being at the pinnacle of prosperity and its economic and military power. And in a sense that is true, compared to the crisis that followed. But despite the high achievements of the Pax Romana, it remains an open question as to whether highly populated Roman cities were as healthy as we often imagine. In this episode, I discuss the sanitation infrastructure and technology of the Roman Empire: aqueducts, baths and sewers. How much did these improve health in Roman cities?