While visiting Dayton, Ohio, we stopped by the Children's Discovery Garden, part of Wegerzyn Gardens Metropark. Unfortunately, this section was closed for some repairs, but I talked to the attendant, explaining we'd driven a long way as we had heard Five Rivers Metro Parks is a leader in Nature Play. She checked with her supervisor and was able to give us a tour of the space, including details we might not have noticed otherwise.
There were animal topiaries throughout--this engaged my son! You can see him here trying to "pet" the bear!