Fort of Milreu
Ericeira, Portugal · built 1670
The Fort of Milreu, also known as the Fort of St. Peter of Milreu (Forte de São Pedro de Milreu), is situated on the Atlantic coast 3km north of the town of Ericeira in Lisbon District of Portugal. Part of a programme to extend Portugal's coastal defences, it was built between 1670 and 1675.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).