Up to modern times have come very interesting information about how the different nations formed postal services and means of transmission of messages over long distances.
Hierarchical ancient civilization of the Incas could control their large-scale ownership due to the good transport links between settlements and the organized courier service. On the roads they traveled on foot and by caravans of llamas. Every pointer was placed on each 7 km distance, and on 20-30 km resting point for travelers and caravans was. Couriers-messengers had to stand on every 2.5 km of route. Due to this, if necessary to share important news, information came through the 2000 km to the place of destination in just 5 days.