Castel Sant'Elmo is a medieval fortress located on the Vomero Hill near Naples, Italy. It offers a panoramic view of the city and the surrounding bay. The castle's strategic position has played a significant role in the defense of Naples through the centuries. Originally an earlier 10th-century fortress, the current hexagonal star-shaped structure dates back to the 14th century, with major renovations done in the 16th century under the rule of Charles V. Over time, it has served various purposes, including a prison, military barracks, and nowadays, as a museum and venue for cultural events. The site includes the adjacent former Charterhouse of San Martino, a large monastery complex now also serving as a museum. Visitors can explore the ramparts, towers, and enjoy the breathtaking views. The complex also hosts temporary art exhibitions, further enriching the cultural experience.