Fort of Paimogo

The Fort of Paimogo, also known as the Fort of Our Lady of the Angels of Paimogo, stands in a dominant position on Paimogo beach near the town of Lourinhã, Lisbon District in Portugal Constructed in 1674, it ceased to serve a military function in 1834 and is now under threat from coastal erosion. The fort presents an almost unique example of a fort from that period that has not undergone subsequent modification.

Source: Wikipedia