Boloraberd Fortress, also known as Proshaberd, is located in Vayots Dzor district and can be found 6-7 kilometers to the north of the town of Vernashen. Boloraberd Fortress was built in the 13th century on an inaccessible mountain and occupied an area of 1-1,5 hectares. The fortress was built by Prince Prosh who is also known to have enlarged the sacred Monastery of Geghard, where the holy lance was once kept. The walls of the fortress were made of basalt. In addition, the fortress had water supply; the pipes can be seen even today. Both the pyramids and the walls were as well preserv.