Ancient rock paintings have been found in

Spain

Explanation:

The oldest cave paintings in the world are in Spain. In 2012, a group of archaeologists concluded that certain series of cave paintings found in Spain had been painted by Neanderthals, and not by the first humans, as previously assumed. Other scientists complained about the methodology used to date the paintings and doubted that Neanderthals had the capacity for symbolic thinking. Now, thanks to an updated dating technique, scientists have shown once again that Neanderthals are the most likely source of those paintings.

answer; the department of energy's