Some of the most impressive rock-cut mega-complexes are preserved at the Bulgarian territory. These are cult places in the sacred territory of which are usually encountered all possible elements – rock-cut altars, sacrificial pits, purification basins, haut-relief discs, caves (natural or rock-cut ones), stairs and platforms, chambers hewn in the rocks, stake beds for wooden constructions and buildings. Frequently, but not always", the entire space or its central part was protected with a wall. The clearest expressions of these are the mega-complexes "Harman Kaya", "Tatul", "Shterna" – Momchilgrad county, "Tangurduk Kaya", "Perperek" – Kurdzhali county, "Gluhite kamuni" (The deaf stones) next to village Malko Gradishte – Ivailovgrad county, the rock sanctuary outside Svirachi village – Ivailovgrad county, "Paleokastro" – Topolovgrad cantry, "Belintash" – Assenovgrad county, and oth. Even though research on these sites is still forthcoming, the ceramics and the terrain itself make it clear that some of the sites had begun to function as cult places at the end of the Eneolithic era.