Although these baths were built in the 4th century AD, some of their parts are still quite well-preserved and worth visiting.
Wikipedia https://it.wikipedia.org/wiki/Terme_di_Costantino_(Arles)
Address 14Bis Rue du Sauvage, Arles 13200, France
Coordinates 43°40'44.281" N 4°37'38.036" E