Engineering · Roman Empire Daily
Augustus set up a gilded monument in the Forum from which distances along Rome's roads were measured.
Deep dive
The Milliarium Aureum, or Golden Milestone, marked the symbolic center of the road network. The later saying that 'all roads lead to Rome' echoes this idea, though the phrase itself is medieval.
Source: Cassius Dio, 'Roman History,' 54.8; Pliny the Elder, 'Natural History,' 3.66.