Jajce fort – castle, citadel is located within the complex of the medieval town of Jajce, at an altitude of 470 meters. The fortress is an irregular square, which is determined by the configuration of the land. Its volume is 260 meters, and the surface of 4,800 square meters. Within the walls is the well which is still located in the same place. It is assumed that the fortress existed already in the 13th century. The fortress was built over several centuries, repaired and renovated. The original entrance to the fortress (barely one meter wide) is located on the west side.