The Belogradchik Rocks are a natural phenomenon that is unique not only in Bulgaria, but also in Europe. Their silhouette has been sculpted over 230 million years to create natural sculptures of mythical creatures, animals, and birds. The rocks extend for about 30 km in length and reach up to 200 m in hight. Over 100 caves have been formed, while the rock columns shape the Kaleto Natural Fortress.
In 2009, the Belogradchik Rocks were among the 77 finalists out of 260 participating sites in a large-scale competition to determine the new Seven Natural Wonders of the World.