Not far from where I live is one of the neatest places I've ever visited. From buffalo to red tail hawk to acres of restored prairie to the worlds most powerful collider Fermi National Accelerator Laboratory is a wonderful place. The Lederman Education Center brings the science of high energy physics to kids. Dozens of American Bison roam hundreds of acres. If you're lucky one of the many deer, hawks, coyote, or foxes will appear and pose for a picture. Even in the winter there is plenty of activity. In the summer the birds and butterflies appear. Those who look for them are treated to a wonderful display of color.
Since 9/11 access has been severely restricted. Recently it's been opened up for visitors again. If you're in the area take some time and visit. It's worth the time.