The Coiled Earth, Adena, Hopewell, and the Great Serpent Mound

Stand at the edge of the ridge in Adams County, Ohio, and you are looking down at a shape that took months of communal labor to raise from raw earth: a serpent, one thousand three hundred and forty-eight feet long, its body uncoiling in seven great curves, its open mouth cradling an oval form. You cannot see it whole from the ground. That was perhaps the point.

The people who built this earthwork, scholars assign the earliest phase to the Adena culture, roughly two thousand three hundred years ago, with later Fort Ancient additions around nine hundred years back, left no written language and no name for themselves. What they left was the land itself, reshaped. Across what is now Ohio, the Adena raised hundreds of cone-shaped burial mounds, piling earth over the honored dead generation after generation.

Their trade networks ran from the Rocky Mountain obsidian fields to Gulf Coast shell beaches, knitting the continent long before any European imagined it. Then came the Hopewell tradition, beginning roughly two thousand years ago, and Ohio became the center of a ceremonial world without equal in ancient North America. At Newark, paired geometric earthworks enclosed four square miles, a circle, a square, an octagon aligned to the lunar standstill cycle.

At Chillicothe, Hopewell artisans worked copper and mica and obsidian into objects of breathtaking refinement: hands, antlers, sharks' teeth rendered in hammered metal. Hopewell declined around fifteen hundred years ago, for reasons still debated. The earthworks they left behind were so strange to the first Anglo-American settlers that those settlers invented an imaginary vanished civilization to explain them, refusing to credit the ancestors of living Native peoples.

Ohio History Connection now manages Serpent Mound. Unlike the nearby Hopewell ceremonial earthworks, which were inscribed as a UNESCO World Heritage property in two thousand twenty-three, Serpent Mound itself was not included in that designation. The serpent in Adams County has been waiting here, patient in the Ohio clay, for three thousand years.