Pernik Fortress is a historical site located in Pernik, Bulgaria. It dates back to the 5th century and served as a strategic military stronghold throughout various periods, including the Middle Ages. The fortress is situated on a hill, providing a commanding view of the surrounding area, which made it an important defensive structure. The fortress features well-preserved walls and towers, showcasing the architectural style of its time. Visitors can explore the remnants of the fortress, which include a citadel and several defensive structures. Today, Pernik Fortress is a popular tourist attraction, offering insights into Bulgaria's rich history.