Bulgaria's Perperikon - Metallurgical Centre 13 Centuries BC

Bulgarian archaeologists announce on Thursday they have made an incredible discovery in the Perperikon area, an ancient living region of Thracians.

The archaeologists said last summer they discovered the missing link in Thracian's history. They have found evidence for the transition from the late Bronze epoch to the early Iron epoch.

At the end of the Bronze epoch, as a result of cataclysms a global system is destroyed. Scientists call the system "East Mediterranean Civilization". After its end, there came the so called "dark ages" - a period, who until recent was a mystery for archaeologists.