remains of the walls of the old fortress bocac on the rocky bank on top of canyon of the river vrbas near banja luka

aged ancient architecture balkans banja banjaluka bank boaac bocac bosnia building canyon castle cloudy destroyed environment europe evening forest fort fortification fortress grad heritage herzegovina hill historic historical history landmark landscape luka medieval mountain mrkonjia nature nobody old outdoor overgrown remains river rock rocky ruin scenery stone stronghold summer top tourism travel tree vrbas walls