Ontario, Canada petroglyph person manually traced from public domain image at http://en.wikipedia.org/wiki/File:Pet..…
Val Camonica, Italy "ancient astronauts" manually traced from public domain image at http://en.wikipedia.org/wiki/F..…
Iberian petroglyph stork automatically traced from public domain image at http://en.wikipedia.org/wiki/File:Arte_es..…
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Neolithic cave paintings found in Tassil-n-Ajjer (Plateau of the Chasms) region of the Sahara manually traced from ..…
Colored previous upload of cave painting from Tadrart Acacus (Acacus Mountains) in the desert of western Libya, a U..…
Neolithic cave paintings found in Tassil-n-Ajjer (Plateau of the Chasms) region of the Sahara manually traced from ..…
Cave painting from Tadrart Acacus (Acacus Mountains) in the desert of western Libya, a UNESCO World Heritage Site. ..…
Native American petroglyph near Saint George, Utah, United States of America petroglyph manually traced from public..…