The Thermae of Constantine, Thermes de Constantin in French (Baths of Constantine), the Roman bathing complex, dates from the A.D. fourth century and is situated on Rue D. Maisto in the north of the town near the arm of the river called the “Grand Rhône”.

Of the once-extensive series of buildings, which resembled a palace, only the Caldarium (warm bath) and parts of the Hypocaust (underfloor heating) and the Tepidarium (warm air room) remain.