The ancient Thracian city of Perperikon (also Perpericon) 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. The village of Gorna Krepost ("Upper Castle") is located at the foot of the hill and the gold-bearing Perpereshka River flows near it. 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.
A visitor centre is being constructed at a cost of 2.4 million Euros.