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The pre-Roman ruins of Citânia de Sanfins represent some of the most important archaeological findings in the Iberian Peninsula. The site occupies over 15 hectares (37 acres) of Palaeolithic and Neolithic ruins including buildings, roads and innovative bathing facilities, while evidence from Roman times include engraved stones and pottery. The archaeological museum of Citânia de Sanfins is located nearby, dedicated to the research and conservation of this remarkable collection of findings.
*thanks to portugal-live for the news*
*picture not mine*
Source link: http://www.portugal-live.net/UK/places/porto.html