The Moorish Castle (Castelo dos Mouros) is a dramatic 8th-century hilltop fortress overlooking Sintra, Portugal. Built during the Islamic rule of the Iberian Peninsula, its rugged stone walls stretch along mountain ridges like a medieval crown. Visitors can climb the well-preserved battlements for breathtaking views of Sintra's palaces, the Atlantic Ocean, and lush forests below. Unlike ornate Sintra palaces, this UNESCO-listed site showcases raw military architecture adapted to the natural landscape. The castle's strategic location made it a key defensive stronghold for centuries before being abandoned and later restored in the 19th century.