Of course there is the Roman Amphitheater:
Inside the Amphitheater:
More arches in Arles
Down almost every alley
It is common to see a few arches when you look down a narrow alley. In places where there wasn’t room to put in a foundation the buildings support each other.
The Mairie (town hall)
This town hall has a fascinating structure of partial arches carefully balanced. It’s held up for a very long time, the building was completed in 1676. You can read a bit about it here: The Vault of the Hôtel de Ville in Arles.
Van Gogh’s arches
The garden of the former hospital building is maintained to look like van Gogh’s “Garden of the Hospital in Arles”.
The Church of St. Trophime is a lovely building with lots of arches, inside and out. If you are interested here is the Wikipedia article about it: Church of St. Trophime, Arles. The article includes a description of the fascinating sculptures around the portal.