Copper Culture State Park in Oconto, Wisconsin, preserves one of the state’s most important archaeological sites: an ancient burial ground used by the Old Copper Complex culture from about 4000 to 2000 BCE. Rediscovered in 1952 after human bones were found in an old quarry, the site soon yielded burials and grave goods showing extensive use of copper alongside stone, bone, antler, and shell. Recovered objects included tools, ornaments, and ceremonial items. Recognized as a National Historic Landmark and listed on the National Register of Historic Places, the park also includes a museum in a 1924 farmhouse displaying artifacts and photographs from the excavations.