Knin Fortress is the largest fortification fort in Croatia and second largest preserved fortification fort in Europe. The original appearance of the fort, due to the lack of original structure, is not fully known. Presumably the fortresses of that time, had been surrounded by high walls, and the construction was customized according to terrain configuration, in some places protected by natural steep slopes.
Today’s appearance was given in the early 18th century, when it was artificially cut off from the hill „Spas“ that resides on the northern side. It is divided into the upper, middle and lower city, which are interconnected by mobile bridges. The oldest is the upper town on the northern part of the fort, while the middle and lower town were built in the late Middle Ages.
Knin Fortress is a protected urban area and is registered in the Register of Cultural Heritage of the Republic of Croatia as a monument of zero category, meaning a monument of special national interest.