Forte de São Sebastião
Nossa Senhora da Conceição, Portugal
Forte de São Sebastião, also referred to as Castelo de São Sebastião or simply Castelinho (lit. 'Little castle'), is a fort located in the port of Pipas, parish of Nossa Senhora da Conceição, in the city and municipality of Angra do Heroísmo, on the south coast of Terceira Island in the Azores.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).