The most impressive remaining architecture is the Arenes, built in the first century, originally seated 20,000 and is still used today for bullfights. It is being cleaned and I tried to get a picture showing the clean versus the dirty.
Arles' other claim to fame is Vincent Van Gogh. He spent time here n 1888 and 1889 including time in a hospital being treated for what we would call depression. He painted some of his finest works during this time.
Cafe Terrace at Night, then and now.
Van Gogh also painted The Starry Night Arles which is housed in the Musee d'Orsay in Paris and The Yellow House Arles on exhibit in the Van Gogh Museum, Amsterdam, that we visited in 2006.