Fort of Casa - Credit: Wikimedia Commons
The Fort of Casa was the most easterly of the forts and redoubts built in 1809-10 during the Peninsular War on the second line of the three defensive Lines of Torres Vedras aimed at protecting the capital of Portugal, Lisbon. It is situated in the town of Forte da Casa, in the municipality of Vila Franca de Xira, in the Lisbon District. Read more on Wikipedia
Source: en.wikipedia.org