Great Serpent Mound Ohio, USA

This man-made earthwork in the shape of a long, uncoiling serpent a quarter of a mile long was created between 1000 and 1500 CE for unknown purposes. It is now protected in a state park in Ohio.

map of the Great Serpent Mound
Location map of the Great Serpent Mound, Ohio, USA.
map of the Great Serpent Mound
Aerial view of the Great Serpent Mound.