The white buildings of the 'old town' rise up behind the ruins of the salt factory, the Factoria de Salazones. This dates from the 4th century BC. For a few hundred years, mainly during the Roman occupation, the main industry here was to salt fish for export to places around the Mediterranean Sea. They also made a paté called Garum, which consisted of fish, oil, salt and spices, which was very popular for sailors. It was considered to prevent scurvy.