The Belogradchik Fortress. The fortress' walls are over six feet thick in the foundation. The initial fortress was constructed during the time when the region was part of the Roman Empire. The rock formations in the area served as a natural protection. Initially, the Belogradchik Fortress served for surveillance rather than defense. Bulgarian tsar of Vidin Ivan Stratsimir extended the old fortress in the 14th century, building fortified garrisons in front of the existing rock walls.
Belogradchik is a town in Vidin Province, Northwestern Bulgaria. The town, whose name literally means "small white town," is situated in the foothills of the Balkan Mountains just east of the Serbian border and about 50 miles south of the Danube River. The town is famous for its unique and impressive rock formations, the Belogradchik Rocks, which cover an area of nearly 60 square miles and reach up to 600 feet in height. It has a population of just over 5,000 inhabitants.