Kayan Fortress, also known as Aknaberd or Kayanberd, perches dramatically on a sheer cliff between the villages of Akner and Haghpat, towering above the Debed River canyon in Armenia. Built in the 13th century to defend the nearby monasteries of Haghpat and Sanahin from invaders, the fortress stretches approximately 120 meters along the canyon ridge, accessible only from its southern end. The fortification features approximately 15 towers and mighty defensive walls reinforced by natural gorges on three sides, with ruins of buildings, ancient water systems, and the St. Astvatsatsin church visible on the site. A 1.5-kilometer hiking trail provides access to the fortress, rewarding visitors with panoramic views over the distinctive Debed canyon landscape and remnants of its medieval ecclesiastical protection mission.