Effigy Burial Grounds, unique in the world, are found primarily in southern Wisconsin. Sheboygan is fortunate to have one of the sites uncovered here. located in the Black River area are 18 of them in animal and geometric forms. Their builders were nomadic Native Americans living between 500 and 1000 A.D. The Open Mound Exhibit contains artifacts and replica skeletal material. A walking path for free self-guided tours provides easy viewing.Another feature of the park that is extremely popular, particularly to nature-loving tour groups, is a boardwalk trail through the wetlands. Clearly demonstrated and meticulously identified are many examples of foliage of the nothern hardwood province. Many plant species found in northern Wisconsin can be seen here, species that are rare only a few miles to the west. The park is located on Sheboygan's far south side.