Effigy Mounds National Monument
Clayton, Iowa
Photo: License: Public Domain
Effigy Mounds National Monument preserves more than 200 prehistoric mounds built by Native Americans including numerous effigy mounds shaped like animals, including bears and birds.
The monument contains 2,526 acres (10.22 km2) with 206 mounds of which 31 are effigies. The largest, Great Bear Mound, measures 42 meters from head to tail and rises over a meter above the original ground level.
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