49 Rue Monge
- Historic Sites: "This amphitheater, originally used as a stage, was later a cemetery. It was later filled in following the building of the wall of Philippe Auguste in ca. 1210. Les Arènes were rediscovered between 1860-1869 when the Compagnie Générale des Omnibus sought to build a tram stop on the site."
- Best for Historic Sites Because: One of two oldest architectural remains of Paris dating from Biblical times, this amphitheater was re-discovered, then re-opened as a public square in 1896.