Castelo de Almourol is a medieval castle located on an island in the Tagus River in Portugal. Built in the 12th century, it served as a strategic military stronghold during the Reconquista, the period when Christian kingdoms sought to reclaim territory from Muslim rule. The castle features a circular keep and thick stone walls, showcasing the architectural style of the time. Today, Castelo de Almourol is a popular tourist attraction, accessible by boat. Visitors can explore its historical significance and enjoy panoramic views of the surrounding landscape. The castle is a symbol of Portugal's rich history and cultural heritage.