40,000 years ago, during Palaeolithic times, the use of stone weapons and tools was considered top-notch technology, the know-how of which belonged to the hands of few.

In Northern Greece, (cities of Kilkis and Pella) archaeologists discovered a well- organised workshop, about the size of a modern plant which specialised in stone craftsmanship and production of stone tools and weapons.

Traces of this ancient "plant" were discovered in three different areas by Axios River and the location was not at random, since sites close to rivers provide various advantages such as hunting, food for the settlers and workers as well as raw material for the construction of the products.

Archaeologists reckon that populations preferred the river side even one million years ago. In the area where the "plant" was situated, scientists found more than 500 stone by-products and 70 tools used for manufacturing other instruments. The activity revolving around stone craftsmanship in the excavation area of Polypetro is believed to have thrived until the Middle Age.