Orinoco River
Colossal petroglyphs could be ancient boundaries, research suggests
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news about fascinating discoveries, scientific developments and more. Ancient petroglyphs in what is now South America – believed to be among the largest in the world – were intended to mark the boundaries of the areas inhabited by their creators, according to a … Read more
Colossal petroglyphs could be ancient boundaries, research suggests
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news about fascinating discoveries, scientific developments and more. Ancient petroglyphs in what is now South America – believed to be among the largest in the world – were intended to mark the boundaries of the areas inhabited by their creators, according to a … Read more