A new interpretation of Serpent Mound, based on American Indian mythic stories portrayed in a remarkable series of pictographs from Picture Cave in Missouri, is offered by James Duncan, Carol Diaz-Granados, Tod Frolking and me in a paper published online last month in the Cambridge Archaeological Journal. We argue that images of serpents and other supernatural beings on the walls of Picture Cave help us make sense of those parts of Serpent Mound that weren't restored. One group of pictographs shows a serpent facing a humanoid female with her legs spread apart next to a large oval that might be...