The Roman thermae (baths) of St. Thomas are situated between two very important ancient towns: Kalydon to the east and Pleuron to the west. They were built on the side of the highway that connected these cities during the time of the Roman Emperor Trajan (2nd century AD) and provided visitors with all the expected amenities: a large pool for the cold bath, a central area with four cylindrical pools for the warm bath (each pool could accommodate two users at a time and water fell on them like a waterfall) and smaller rooms of various shapes with individual basins for the hot bath. There were also dressing, sweating, and massage rooms. The walls survive to a height of 7 meters.