A fascinating journey in the Ancient Rome through the Itinerarium Maritimum Antonini Augusti, the work that reveals the relationship of the Romans with the sea. An analysis of the more than 150 localities mentioned by the Itinerarium Maritimum, with historical, archaeological and geomorphological insights. A picture on the culture of the sea at the time completed by a rich set of indications on the marineria, the winds and the gods protectors of sailors.On the Routes of the Romans is also an investigation of the ability of the time to assess distances at sea: the estimates of the ancient register are related to the real measurements, and the degree of accuracy, most of the times, is surprising.