Idanha-a-Nova Castle is a historic fortress located in the town of Idanha-a-Nova, Portugal. Built in the 12th century, it played a significant role in the defense of the region during the Middle Ages. The castle features impressive stone walls and towers, offering panoramic views of the surrounding landscape. The castle is part of the Alentejo region and is classified as a National Monument. Visitors can explore its ruins and learn about its history, which reflects the architectural styles of the time. The site is a popular destination for tourists interested in Portuguese heritage and medieval history.