One of the highlights of Sintra not to be missed. Ruins of a castle built by the Moors from the 10th century onwards. Apparently, when Cascais was under the rule of Sintra, a huge fire would be lit here annually to remind the people of Cascais that the Moorish Castle is there to protect them. There isn’t much inside the castle but the views from around 400 m above sea level are stunning. Be careful on the walls though, they’re very narrow in places and lack any safety railings...