Effigy mounds are ceremonial mounds in shapes of animals, built by American Indians who lived in this area. There are thousands of mounds near upper Mississipi river. ☞ Effigy Mounds National Monument Iowa is a very interesting historical site with good easy hiking trails and great views of the Mississippi. ☞ Wyalusing State Park is just across the river. Good camp site, more hiking trails and half a day canoe trail through the wetland in the triangle between the Mississippi and Wisconsin River. Good weekend spot for Chicagoans.
Lidar of Marching Bears Mound Group
Effigy Mounds National Monument and Wyalusing State Park trail maps