The medieval proverb declared that “all roads lead to Rome.” For a thousand years or so, Rome was the political and military center of the Mediterranean world and Europe. The empire was also the architect of an advanced and excellent network of roads — so much so that miles of those ancient roads survive to this day. It is easy to imagine, therefore, a model in which Rome was the great hub of a network of highways — much like Chicago was to trains in an earlier generation. Whatever road one was on, one might expect to see a sign indicating how many miles to Rome.