Description: 50m above the city, a ring of crenellated walls and towers rises from a steep glacis, encircling a mass of ruins from every period. It has always been extremely important, both strategically and militarily. It was built in the days of Sayf al-Dawla al-Hamadani, on the remains of earlier civilizations. The citadel's fortified entrance is a marvelous example of Arab military architecture. On the north and south sides, great towers rise above the moat. This moat, 20m deep and 30m wide, emphasizes the fortress's proud isolation.