Within the folds of these magnificent rocks once hid the haidouks, bedevilling the Turks and making armed mischief. However, these craggy peaks a few kilometres out of town are not exactly blue, and not particularly different from other craggy peaks encountered around the world, though the air is crisp and clean and the views from above are marvellous.
A chairlift can get you up there, or you can walk (one to 1½ hours) up the hill following the chairlift. From the top of the chairlift, a path leads down about 300m to the main road; cross it and proceed 500m through the woods to Hizha Poveda, which serves drinks and meals.
To reach the chairlift from Sliven, catch minibus 13 outside the train station or Hotel Sliven. Alternatively, walk about 1km uphill from the end of the route for trolleybus 18 or 20 from the centre. Taxis are about 6 lv one way.