Fort of São Francisco do Queijo
Aldoar, Foz do Douro e Nevogilde, Portugal
The Fort of São Francisco Xavier (Forte de São Francisco Xavier), commonly known as the 'Castelo do Queijo' (Cheese Castle), is a fortification situated on the coast of the civil parish of Nevogilde in the northern Portuguese municipality of Porto.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).