Certain regions of North America are well known for their early Amerindian earthworks. Ohio, for example, was littered with earthworks, mostly in the form of conical mounds. There are also a number of geometric and effigy mounds.

My Effigy Mound Articles:

Great Serpent Mound, Adams Co., OH
From Squier and Davis (1848)

Great Serpent Mound Links:

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