The Temple stands opposite the spa. In Roman times, the two were linked by a road. There was a pre-Roman temple, a building from the Etruscan era built around the late 4th Century B.C. which was much smaller and simpler in layout with a single cell – the holy chamber – which housed the image of the divinity. This cell had two adjacent rooms. Outside there was a colonnade accessed by climbing up steps that still exist today. The floor was in beaten earth and the walls were coated with red plaster. The votive offerings came from the cell and comprised small bronzes and coins now exhibited in the museum.