If you want to be astonished at what human beings could do more than 30,000 years ago, see the film Cave of Forgotten Dreams. It is a documentary by Werner Herzog, whose team was given access to the Chauvet caves in southern France. If this rock art doesn't blow you away, nothing will. See a trailer at http://www.rottentomatoes.com/m/cave_of_forgotten_dreams/trailers/11133088