Constructed in A.D. 19 at the base of the Croix Rousse hill, this Roman amphitheater held up to 20,000 spectators. It became the site of gatherings for the 60 Gallic tribes, for gladiatorial combats and later for the Christian persecutions in 177. Classified as a historic monument in 1961, it is now integrated into Lyon’s oldest park, the Jardin des Plantes. Although you can’t wander around the grounds, you can view the amphitheater from the outside.