Comment Comment by googlryas Wikipedia first line:> The Serpent Mound is believed to have been built by the Native American Adena peoples around 320 BCE, and then either added to or repaired by the Fort Ancient peoples around 1100 CE.So maybe 2k years? parent googlryas 3 years ago
> The Serpent Mound is believed to have been built by the Native American Adena peoples around 320 BCE, and then either added to or repaired by the Fort Ancient peoples around 1100 CE.
So maybe 2k years?