Bjni Fortress located in the village of Bjni in the Kotayk Province of Armenia. The fortress of Bjni was built in the 9th to 10th centuries by the royal Pahlavuni family of the Bagratuni Dynasty.It sits on the top and along the sides of a mesa that divides the village nearly in half. The walls of the fortress may only be seen from the western side of the village. Bjni Fortress is 1,504 metres (4,934 ft) above sea level.    

There is also the stone foundation of a church of the 5th century, a medieval structure that is still partially standing (currently being rebuilt as of 2009), two cisterns one with the remains of intact vaulting, and a covered passage that led to the river in the event of a siege.