About: Walls of Lisbon

The walls of Lisbon are a series of three nested defensive stone-wall complexes built at different times to defend Lisbon. They consist of the São Jorge Castle proper and its walls (cidadela or citadel), the cerca moura (or cerca velha) and its lateral extension the muralha de D. Diniz, and the cerca fernandina. While the castle walls are essentially intact, the remaining walls are only visible in fragments embedded in buildings and open spaces in contemporary Lisbon. If it was remade into a 1 m high wall, the masonry in the cerca fernandina would stretch from Lisbon to Porto, approximately.