A stone slab forgotten for a century has been deemed the oldest map in Europe
The stone slab dates back to some 4,000 years ago during the Bronze Age
It was first discovered in France in 1900 and then sat in a castle cellar until 2017
Experts recently analyzed the slab, which shows etchings of West Brittany
There is a 3D shape to represent the valley of the River Odet in France