Hilltop fortress crowning Alfama, Moorish origins, expanded under Portuguese kings, and the defining panorama of Lisbon. The views justify the climb. The castle itself is mostly reconstructed but the ramparts and archaeological site are genuine.
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Walk the ramparts for 360-degree views: Tejo river, Baixa grid, red rooftops cascading down the hillside. The archaeological site shows Moorish, Roman, and Iron Age layers. Bring water and spend time on the observation terrace at Torre de Ulisses. The peacocks roaming the grounds are photogenic. Skip the museum unless weather is poor.
Early morning or late afternoon for light and manageable temperatures. Sunset is popular but crowded. The castle stays open until 9pm in summer — twilight views are spectacular. Climb via Alfama streets rather than taking the tram for the full experience.
Moorish fortification from the 11th century, captured by Afonso Henriques in 1147 during the Reconquista. Served as royal palace until the 16th century when the court moved to riverside Terreiro do Paço. Earthquake damage in 1755 was extensive. The current walls are heavily restored (1940s) and controversial among historians, but the site's strategic importance is undeniable. The views are the real attraction. Verify opening hours as the castle occasionally closes for state events.