SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Stone Age rock carving. Rock carvings (petroglyphs) are found in many regions of the world. They are among the oldest human artefacts still existing, with many of them dating back tens of thousands of years to prehistoric periods such as the Stone Age. Photographed in 1990, in the Gorno-Altayskaya autonomous region of Russia.
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