Milliarium Aureum
Rome, Italy · built -19
The Milliarium Aureum (Classical [miːllɪˈaːrɪ.ũː ˈau̯rɛ.ũː], Miliario Aureo), or the "Golden Milestone," was a monument, probably of marble or gilded bronze, erected by the Emperor Augustus near the Temple of Saturn in the central Forum of Ancient Rome. All roads were considered to begin at this monument and all distances in the Roman Empire were measured relative to it. The monument's precise location and inscription has remained a matter of debate among historians.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).