Notwithstanding, how the Serpent Mound came to be in Ohio (North America) remains a mystery. IFL Science points out that the mound's origins were the subject of archaeologists' debates over the ...

Possibly even snakes, although the famed Serpent Mound is not attributed to the Hopewell Culture, even though it is found in the same region of Ohio. Pyramids are from civilizations from long ago.