Citadel of Cascais

The Citadel of Cascais is a fortress complex located on the Atlantic coast that was originally built with towers and defensive walls to protect the shoreline. The overall site contains multiple structures including fortified towers, protective walls, and a palace section that stand together on the grounds.

The original construction dates to the late 15th century when a defensive installation was built to protect against sea attacks. Later in the 19th century, the fortress was transformed into a royal summer residence, serving new purposes.

The site reflects its transformation from pure military stronghold into a royal residence through the blend of fortress architecture and palace spaces that visitors can observe today. The contrast between the fortified outer walls and the refined interior rooms shows how the purpose of the place evolved over time.

The complex is accessible daily and can be explored on your own, with outdoor areas and some sections available without admission charges. To enter the palace section within the fortress, however, a fee applies, and it is wise to verify opening times before your visit.

The grounds were the site of a groundbreaking technological innovation when it became the first location in the country to receive electric street lighting. This achievement marked an important milestone in the history of Portugal's modern infrastructure.