The Umbilicus Urbis Romae and Altar of Saturn in the Forum, Rome. The Umbilicus Urbis Romae "Navel of the City of Rome" was the symbolic centre of the city. The current ruins date from the same time as the Septimius Severus Arch (partly seen behind) to 203 AD. https://en.wikipedia.org/wiki/Umbilicus_urbis_Romae The Altar of Saturn was constructed prior to the Temple of Saturn in the 6th century BCE. https://en.wikipedia.org/wiki/Altar_of_Saturn 237 photos taken in February 2026 with a Sony a7R V and processed in RealityScan.