The fortress of Askeran is in the village of Askeran, in Nagorno-Karabakh just 14km far from Stepanakert. It was built by the Karabakh khanate ruler Panah Ali Khan. It was a famous strategical fort since the 18th century and had to face a lot of battles. The 9m tall and 2m thick walls are quite impressive. Inside the walls you can find secret paths and plenty of different openings.