Serpent Mound

Serpent Mound is the great surviving effigy mound of North America: a low earthen serpent over 1,300 feet from nose to tail coil, laid along a bluff above an Ohio creek at the rim of a meteor-impact structure hundreds of millions of years old. No artifacts were found inside it when Harvard's Frederic Ward Putnam excavated in the 1890s, which is why its age is still argued. Attribution moved from the Adena culture to a 1991 radiocarbon date placing it around a thousand years old with the Fort Ancient culture, then back toward the Adena with a 2014 study proposing an older date; the Ohio History Connection, which runs the site, says plainly that more work is needed.

What the mound means is even less recoverable than when it was built. The head faces the summer solstice sunset in the standard account, with other claimed alignments through the tail coils and the oval at the center, and these readings are debated in the literature; the site's own interpreters frame it as an American Indian story written in the earth without claiming to know its plot. The modern life of the place includes solstice and equinox gatherings organized by its friends' group, and the site's UNESCO story continues: it has been on the national tentative list since 2008 and was pointedly not part of the 2023 Hopewell World Heritage inscription.

Visiting

The Ohio History Connection's Serpent Mound page carries hours (closed Mondays, final entry an hour before close) and the per-vehicle fee; guided archaeology tours run twice monthly.

Photo: [Wikimedia Commons](https://commons.wikimedia.org/wiki/Category:Serpent_Mound), CC BY-SA 4.0.