We visited Volo Bog in Illinois after our visit to Orchids by Hausermann, located in Chicago. It was very nice with a boardwalk which made viewing easy and accessible.
If you're looking for a truly unique outdoor adventure, head for Volo Bog State Natural Area in Lake County in northeastern Illinois. The site includes Volo Bog, the only quaking bog in Illinois, significant in that it exhibits all stages of bog succession. A floating mat of sphagnum moss, cattails and sedges surrounds an open pool of water in the center of the bog. (excerpt taken from:
Parks)