Prickly pear cactus along Mississippi Bluffs (photo courtesy of Michael R. Jeffords)

Yonder Prairie, McHenry County (photo courtesy of Scott Kuykendall)

Blackberry Farms Forest Preserve, Kane County (photo courtesy of Forest Preserve District)

Heron Pond Natural Area in Southern Illinois (photo courtesy of Michael R. Jeffords)

1.5 MW Vensys 77 Gearless Turbine (photo provided courtesy of the City of Geneseo)

Kohl Children's Museum

Cook County Courthouse

Photovoltaic panels on the Rice Conservation Center (photo courtesy of Chicago Botanic Garden)