Volo Bog
http://dnr.state.il.us/lands/Landmgt/PARKS/R2/VOLOBOG.HTM  
For a truly unique outdoor adventure, head for Volo Bog State Natural Area in northeastern Illinois. This natural area contains Volo Bog, the only "quaking" bog in Illinois to have an open water center.

Garfield Park Conservatory Alliance
http://www.garfield-conservatory.org/
Explore and discover the treasure within this historic Chicago Botanical Garden.

Horicon Marsh State Wildlife Area
http://www.dnr.state.wi.us/org/land/wildlife/reclands/horicon/
Horicon Marsh, located in southeast Wisconsin, is the largest freshwater cattail marsh in the United States.

Moraine Hills State Park
http://dnr.state.il.us/lands/Landmgt/PARKS/R2/Morhills.htm
From angling to hiking, from viewing rare plants to observing migratory waterfowl, Moraine Hills State Park offers a recreational bounty. Each pull-off from the road leads you to a different kind of area from savannah to oak forest, prairie, and lake.

Cornell Lab of Ornithology
http://birds.cornell.edu
The premiere site for research on birds.

Eagle Optics
http://www.eagleoptics.com/
Optical equipment for birding and nature studies.

Calumet Photo
http://www.calumetphoto.com/
Photography equipment for sporting, wildlife and nature photography.

The Notebaert Nature Museum
http://www.chias.org/
Just steps away from Lake Shore Drive in Chicago’s chic Lincoln Park, you’ll find a natural oasis, conveniently located right in Chicago.