Ingo Arndt / Aboriginal Rock Art / depicting human figure / Anbangbang Gallery / Nourlangie Range / Kakadu National Park, Northern Territory, Australia

Bernard Castelein / Rock doves (Columba livia), sitting in front of typical wall paintings of Shekhawathi region, Shekhawathi, Rajasthan, India

Bernard Castelein / Rock dove (Columba livia), sitting in front of typical wall paintings of Shekhawathi region, Shekhawathi, Rajasthan, India

Juergen Freund / Ancient pictographs (rock / cave paintings) of fish and sea creatures on karst limestone formations. Sunmalelen area, Raja Ampat, West Papua, Indonesia, January 2010

Oriol Alamany / Rock paintings of Terns (Sterna sp) at Ana Kai Tangata cave, Easter Island (Pascua or Rapa Nui), Pacific Island, Unesco World Heritage Site, November 2004

Oriol Alamany / Petroglyph of an Elephant at Khaz'ali Canyon, Wadi Rum Protected Area, Jordan, April 2009

Patricio Robles Gil / Ancient cave paintings of people, deer and wild sheep, Sierra de San Francisco, Baja California, Mexico

Rob Tilley / Rock engravings of the native american Pueblo people, Chaco Culture National Historical Park, New Mexico, USA, February 2009

Tim Laman / Aboriginal rock art with many human hands, at a site called "The Art Gallery", Carnarvon Gorge, Carnarvon National Park, Queensland, Australia

Steven David Miller / A rock art shelter in the northern Kimberley region features a cluster of Wandjina figures peering out from the sandstone rock surface, Northern Kimberley region and the Mitchell Plateau, Western Aust...

Steven David Miller / Bradshaw rock art / Gwion Gwion, Northern Kimberley region and the Mitchell Plateau, Western Australia

Bernard Castelein / Prehistoric rock painting of men and beast, Bhimlat Rajasthan, India