Perperikon is the largest megalith ensemble in the Balkans. It is thought that the famous sanctuary and oracular shrine dedicated to Sabazios (similar to Greek Dionysus) of the Bessi was situated there.
The ancient Thracian city of Perperikon is located in the Eastern Rhodopes, 15 km northeast of the present-day town of Kardzhali, Bulgaria, on a 470 m high rocky hill, which is thought to have been a sacred place.
Human activity in the area dates back to 5000 B.C. The first traces of civilization on the hill date from the Bronze Age, while the ceramics found on the place date from the Early Iron Age, as well as the impressive round altar, almost 2 m in diameter, hewn out of the rocks. The megalith complex had been laid in ruins and reerected many times in history.