The Castle of Portalegre is a historic fortress located in the town of Portalegre, Portugal. Built in the 13th century, it served as a defensive structure during the Reconquista, a period when Christian kingdoms sought to reclaim territory from Muslim rule. The castle features impressive walls and towers, showcasing medieval military architecture. Today, the castle is a popular tourist attraction, offering visitors panoramic views of the surrounding landscape. It is part of the Alentejo region's rich cultural heritage and is often included in local historical tours, highlighting its significance in Portugal's history.