Hastek Castle
Located in Ağın district, Hastek Castle (Hastek Kalesi) consists of carved caves closed to the outside, in the style of shelter, carved from the bottom layer by layer on the rocks descending steeply to the Keban Dam Lake. From the large areas of use in the form of a hall, rooms, warehouses and similar shelters connected to each other with corridors, secret stairs carved into the rock, loophole holes and windows used as a place for ventilation and light reception or defense against the enemy, it is understood that the castle was able to meet many needs in the ages it served. It is thought that the castle was built by Romans or Byzantines against Turkmen raids in about 1018 during the spreading periods of Christianity, such as underground cities in Cappadocia. Today, it is only possible to visit Hastek Castle by boat over the lake.