Did Humans Make These Ancient Cave Paintings?

Or was it Neanderthals? This question and others tantalize researchers investigating early paintings in some of Europe's caves. The paintings date back to a time when Neanderthals and early modern humans lived side by side.

Read more about the first artists online in National Geographic magazine's "Firsts" issue.

Display image courtesy Stephan Alvarez; Department of Education, Culture, and Sport of the Government of Cantabria, Spain.