Local archaeologists believe it could be the largest olive mill yet found in what was the Roman province of Baetica (Andalucia). So how did Roman olive mills work; how much olive oil was exported to imperial Rome 2000 years ago; and which are the most important Roman sites you can visit in Andalucia and the rest of Spain. Main photo: Torreparedones Roman ruins near Baena ( El Pais - photo: Museo Historico de Baena/EPV). Artist´s impression of a...