The castle takes its name from Babak Khorramdin and was probably built during the Parthian period or, more likely, during the reign of the Sassanid kings (the architectural features of these two periods are evident in this building). Babak used this fort against the Arab invasion for more than twenty years.
Babak Castle was repaired and restored in the second and third centuries, AH and a few centuries later, changes were made in it, and additions were made to it. Therefore, after settling in this fort, Babak repaired its main parts and added some parts to it. Now, more than 1,200 years later, parts of that fort have still survived.
Since this is a mountainous area, it is better to visit it in summer. Of course, keep in mind that you have to walk to climb the castle. So be sure to bring enough drinking water to prevent dehydration in the summer.
How to go there: Babak Castle is located 50 km north of Ahar city and in the western heights of a branch of the great Qarahsu river; in an area known as Kaleybar.
The only way to enter is through the main gate and it is not possible to enter the castle from the mountains. Passing through the entrance gate and leaving behind the fort, to reach the main fortress, you have to pass through a narrow passage that has about 100 meters of ascent. This impassable route overlooks a valley with forests on one side and a depth of about 400 meters that continues as a blade and wall to the bottom of the valley.