Perperikon, Bulgaria

Multiperiod site starting in Bronze Age. From Iron Age round altar, almost 2 m in diameter, hewn out of the rocks. Ruins of prehistoric, megalithic city. Most likely the development here started thanks to an important prehistoric shrine, this site was the possible location of the Temple of Dionysius. Construction started around 5000 BC. Around the Roman times here was built massive palace with several stories and massive fortification walls with up to 2.8 m thick walls. Ruins of ancient church, built around the end of 4th – early 5th century. In the vicinity a rocky mountaintop which may have served as a sacred site since the Iron Age. In the time period between the 4th and 1st century BC around the mountain was built a stone wall and sanctuary was built inside.