Near the banks of the Rhône is the entrance to 4th-century Roman baths, which have been partially restored with characteristic bands of brickwork. The baths or thermae are all that remain of a once grand imperial palace that stood here, Palais Constantin. Dating from Constantine's era, the ruins of the baths measure 45 to 98m (148-322 ft.). You enter by the tepidarium (tepid room) and then proceed through the caldarium (hot room), with its remaining hypocaust (heated floors).