The rock art of the Tassili culture is found throughout North African mountains, the Tassili n'Ajjer. The rock art of Europe is well known around the world. Lesser known but just as amazing and less well-understood is the rock art of North Africa. (prev.,prev.) This tradition is thought to have developed independently of European rock art although researchers agree about very little else about it. This art hearkens back to a time when the Sahara's climate was milder and more wet. This rock art has often been compared to the pre-Nguni San rock art of Southern Africa. There are of course people who believe that aliens did it. The more research that is done about this area and its archaeology, the more we may have to rethink our ideas about the Sahara. . Sadly enough, like many archaeological sites it is becoming endangered.