Žrnov consisted of two sections: Gornji Grad or Mali Grad (Upper or Small Town) and Donji Grad (Lower Town). Upper Town consisted of the old Serbian fortress, with some Ottoman expansions from 1442. In 1458 a dry moat was dug the separate it from the Lower Town. It had the base in the shape of regular pentagon, aligned in the northwest-southeast direction. It occupied the area where the Monument to the Unknown Hero is today. Lower Town mostly occupied the ramparts, which followed the outline of the mountain slope. It was a direct continuation of the Upper Town.
