Palácio da Pena X

Looking Down.
The Castle of the Moors (Portuguese: Castelo dos Mouros) is a hilltop medieval castle located in the central Portuguese civil parish of Santa Maria e São Miguel, in the municipality of Sintra. Taken by Christian forces from the Moors after the fall of Lisbon, it was an important strategic point during the Reconquista, and classified as a National Monument, part of the Sintra Cultural Landscape, a UNESCO World Heritage Site.
The castle was constructed during the 8th and 9th centuries, during the period of Muslim Iberia, as the central place in a territory that was primarily agricultural, and which was necessary to protect its population
In 1031, after the loss of Córdoba to the Almoravid dynasty, the king of Badajoz opted to transfer to Alfonso VI of León and Castile a few territories on the Iberian peninsula (among them Sintra) in order to gain an alliance with the Christian king. This transfer did not result in any security, and the castle was lost to the invading Almoravid.
After the conquest of Lisbon (1147) by forces loyal to Afonso Henriques, the castle surrendered voluntarily to Christian forces. Afonso Henriques entrusted the castle's security to 30 inhabitants, granting them privileges in the foral (charter) signed by the monarch in 1154. The charter suggested the that settlers should occupy and inhabit the castle, as a mechanism for guaranteeing the region's security and development.
During the second half of the 12th century, the chapel constructed within the walls of the castle became the parish seat. This was followed by the remodelling and construction under the initiative of King Sancho I of Portugal. cf Wikipedia.