Gallo-Roman enclosure of Le Mans
The Gallo-Roman enclosure of Le Mans, also referred to as the Roman enclosure of Le Mans, is located in the city once known as Vindinum or Vindunum. This city was the capital of the Gallic people, the Aulerci Cenomani.
Source: Wikipedia — Gallo-Roman enclosure of Le Mans (CC BY-SA 4.0)