The Great Mountain Citadel of Perperikon and the Dionysian Cult
In its most ancient history, the Perperikon site was nothing more than a natural formation of wind beaten rock. However, its location and strategic position made it a gathering point for numerous cultures and civilizations over time. Its citadel-like role would emerge only later in its historic life: early on it was mostly religious in nature. Prehistoric cultures of Europe - mostly in the Neolithic - were drawn to such jutting rocks, making them an object of worship. There were plenty of flourishing Megalithic cultures in the Rhodope mountain range, and in fact, Perperikon is clear proof of...
Source: ancient-origins.net