Set on one of the peaks overlooking Sintra, Castelo dos Mouros is a fortification built around the 10th century after the Muslim conquest of the Iberian Peninsula. Two waists of walls roughly skirt the granite blocks of the mountain range, between rocks and steep cliffs.

Along the pathways, visitors can admire a unique landscape that shows, in the foreground, the village, the Paço de Sintra, the Pena Palace and the mountains and, beyond those, the extensive plain to the north and the Atlantic Ocean.