The Romans also had an efficient postal service, which was first instituted by Augustus and greatly improved by Hadrian. The former, as Gibbon states in his "Decline and Fall of the Roman Empire," placed upon all roads leading away from the golden milestone of the Forum, at short distances, relays of young men to serve as couriers, and later provided vehicles to hurry information from the provinces. These posts facilitated communication through all parts of the empire, and while they were originally established in the interest of the government, they proved serviceable to individuals as well, for there is no doubt, that, together with the official dispatches, every courier carried private letters also. The expenses of the post were largely defrayed by the cities through which it passed, these cities being obliged to provide the stations established within their territories with the necessary stores. At the principal stations were found inns, where the proprietors were held responsible for injuries suffered by travelers while in their houses. The communication of the Roman Empire was scarcely less free and open by sea than it was by land. Italy has by nature few safe harbors, but the energy and industry of the Romans corrected the deficiencies of nature by the construction of several artificial ports. After the downfall of the Roman Empire its roads were either destroyed by the people through whose territories they led or by the conquerors, to render more difficult the approach of an enemy.