The Moors occupied Portugal for nearly 500 years! Leaving some magnificent archeology behind. One is located at Sintra and well worth the hike! Check out more information on the Sintra Council website.
Winding over two ridges of the Serra de Sintra, the Moorish Castle dates back to the early days of the Moorish occupation of the Peninsula – the 8th century.
Source: Moorish Castle – castle and palaces – Câmara Municipal de Sintra