Archaeologists have fully mapped a series of ancient rock art in Venezuela and Colombia, including the world's largest monumental engraving, using photography and drone footage.
The masterpieces, which feature both human and animal motifs, are prominently located along the Upper and Middle Orinoco River, which snakes through this region of South America. Researchers think the placement was intentional and was meant to be seen from a distance, since it was along the path of an important trade and travel route known as Atures Rapids, according to a study published Tuesday (June 4) in the journal Antiquity.
