Arènes de Lutèce - Credit: Wikimedia Commons
The Arènes de Lutèce (, "Arenas of Lutetia") are among the most important ancient Roman remains in Paris (known in antiquity as Lutetia), together with the Thermes de Cluny. Constructed in the 1st century AD, this theatre could once seat 15,000 people and was used also as an amphitheatre to show gladiatorial combats. Read more on Wikipedia
Source: en.wikipedia.org