Ston Fortress is a historic fortification located in Croatia, specifically in the town of Ston. Built in the 14th century, it was part of the defensive system for the Dubrovnik Republic. The fortress is known for its impressive walls, which stretch over 5 kilometers, making it one of the longest defensive walls in Europe. The fortress served to protect the valuable salt pans in the area and the trade routes of Dubrovnik. Today, it is a popular tourist attraction, offering visitors stunning views of the surrounding landscape and a glimpse into the region's rich history.