Perperikon is an archeological place associated with very old history, ancient myths and legends of Orpheus, Thracian Gods and tribes, ancient Greece and Roman emperors.
Perperikon (aka Perperakion) is situated in the Eastern Rhodope, about 15 km East of the town of Kurdzhali.
If you are interested in the history and myths, you can find a lot of information on the official Perperikon site: http://www.perperikon.bg/