Effigy Mounds National Monument was established in 1949. The park protects one of the largest remaining concentrations of ancient American Indian earthworks in the United States. It is considered a sacred landscape by members of many modern-day tribes whose ancestors once lived here.
The reverse (tails) design depicts an aerial view of mounds in the Marching Bear Group. Inscriptions are "EFFIGY MOUNDS," "IOWA," "2017," and "E PLURIBUS UNUM."
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