Fortaleza de Nossa Senhora da Conceição
União das Freguesias da Póvoa de Varzim, Beiriz e Argivai, Portugal
The Castelo da Póvoa (English: Castle of Póvoa), also Fortress of Póvoa de Varzim, officially Fortaleza da Nossa Senhora da Conceição or Nossa Senhora da Conceição Fortress, is a Portuguese fortress in Póvoa de Varzim rebuilt during the reigns of Peter II and John V (between 1701 and 1740) to defend the town from privateers, in the site of an earlier fort known as "Forte de Torrão". It is considered a listed property of Public Interest in Portugal.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).