The Belogradchik Rocks are possibly the most famous Bulgarian natural phenomenon. They are located in the Belogradchik region, 175 km from the capital and 66 km from Montana. The area of rocks is 30 km long and around 3 km wide. For millions of years the climate has shaped and changed the stone figures of which there are countless legends. Some of the rocks are named after the figures they resemble. The stronghold Kaleto is located right above the town of Belogradchik – it has been built in Roman times, and its purpose was to guard the Roman military and commercial route, passing through the region.