Babak Fort
Pāpak Fort or Babak Castle (Persian: قلعه بابک, romanized: Ghal’eh-e Bābak), is a large citadel on the top of a mountain in the Arasbaran forests, 50 km from Ahar, one parasang from Ardabil, 6 km southwest of Kalibar City in northwestern Iran. According to Ibn al- Nadim, it was the stronghold of Javidhan and Babak Khorramdin, the leaders of the Khurramites in Iranian Azerbaijan who fought the Islamic Abbasid Caliphate.