This is a blog review of a digital project from Stanford called "Orbis." It is billed as "Google Maps for the Roman Empire." How long would it take Vespasian to march from Judaea to Rome? How long would it take Agricola to travel from Londinium to Mediolanum? How long would it take Domitian's messenger to do the trip in reverse, avoiding the highways, so as not to intercept Agricola?
Anyway, this sounds like a cool development.