Daniel I
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We loved walking along the old walls. It’s not an easy walk, so make sure you wear your most comfortable shoes. But it’s absolutely worth it, the views from the higher points are spectacular. Definitely one of the best places to visit in Sintra. It’s also interesting because from the walls you can spot all the popular landmarks in Sintra: the Pena Palace, Quinta da Regaleira, the old town, and more.
You need a ticket to enter, but luckily it’s not timed, so you can buy it in advance without stressing about time slots. The crowd wasn’t too bad when we visited (a weekend in November).