Neolithic Flint Mines at Spiennes

The Neolithic flint mines of Spiennes are among the largest and earliest Neolithic flint mines which survive in north-western Europe, located close to the Walloon village of Spiennes, southeast of Mons, Belgium. The mines were active during the mid and late Neolithic between 4,300 and 2,200 BC. Declared to be "remarkable for the diversity of technological solutions used for extraction" the site and its surroundings were inducted into the UNESCO's list of World Heritage Sites in 2000.

Source: Wikipedia