At the time of the Roman Empire, a giant multi-story palace was errected according to archeological evidence, and an imposing with its size fortress was built around the hill, with walls as thick as 2.8 m. Temples and quarters of residential buildings were also constructed in the fortress.The megalith complex had been laid in ruins and reerected many times in history.

The ancient Thracian city of Perperikon (Bulgarian: Перперикон) 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 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.