The little valley of the Côa River in northern Portugal is home to an amazing collection of Paleolithic rock art. Thousands of figures of horses, bovines, and other animals, along with human and abstract figures were created beginning perhaps 22,000 years ago. The tradition continued throughout the Stone Age and into the Bronze Age. One particularly imaginative engraving is quite fascinating. It’s not the biggest or the most complicated design, nor the most complete or detailed in the valley. At the Penascosa site, one of three open to the public, a…
