The Fortress of Elvas is a historic military fortification located in the town of Elvas, Portugal. Built in the 16th century, it is renowned for its impressive star-shaped design, which was advanced for its time. The fortress was constructed to protect the region from invasions, particularly during the Iberian Union and the Peninsular War. This UNESCO World Heritage site features thick walls and a series of bastions, making it one of the largest and best-preserved examples of military architecture in Europe. The fortress played a significant role in various conflicts and remains a symbol of Portugal's military history.