Forte de São Vicente
On a hill just north of the city, Forte de São Vicente was the first of 152 redoubts built on the Duke of Wellington's orders to form three defensive lines between the Atlantic Ocean and the Tagus, to protect Lisbon from possible invasion by French troops. Since 2017, it has housed a small visitor center for these Lines of Torres Vedras, with fascinating displays such as a model of the system used to communicate between forts.
