Проходна пещера – “Очите на Бога”
One of the largest karst regions in Bulgaria – Karlukovo gorge full of precipices , rock bridges ( arches ) and holes ( the majority of which mapped ) , more than 280 caves (some of them – gaps ), 3 rock monastery interesting rock formations, is located in Northern Bulgaria , near Republic . And it – the longest cave tunnel in the country – passage cave (262m ) declared a landmark in 1962 g.Etimologiyata name ” Prohodna ” leads to two opposing its entrance – small ( 35mm) and large ( 45 m ) , which are also beginning and end of a natural rock bridge . They are connected by a path passing through all peshtera.V cave shelter is dated human obitatelstvo era of Neolithic and Eneolithic, and forming a passageway in cross Iskarski fault refers to kvartenera . In Dark Hole (one of the longest caves in the Balkan Mountains ) , to the left of the small entrance of the pass , found artifacts – remnants of ancient inhabitants.