Miamisburg Mound, one of the largest conical earthworks built by the prehistoric Adena culture
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octagon earthworks
They are believed to have been used as monuments for spiritual ritual ceremonies. Platform mounds are pyramid or rectangular-shaped mounds that are used to hold a building or temple on top
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a fire tower in Ohio
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ancient Indian Mounds in Back Ground , I passed
along the way
My Honda Insight Hybrid , averaging 51 MPG
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