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 majority of the mounds were constructed between one thousand and two thousand years ago — often to inter the dead, but sometimes for ceremonial purposes, or to tell important stories.
- Special proof strike minted in low quantities
- Minted at the U.S. Mint at San Francisco
