http://dnr.state.il.us/law3/Documents/ConcealedCarryQnA.pdf 5) On what IDNR properties may an Illinois Concealed Carry Permit holder carry a concealed firearm? Illinois Concealed Carry Permit holders may carry a concealed firearm on any IDNR real property (including bike trails, trails, or any other designated public hunting area or building where firearm possession is permitted by the IDNR) with the following exceptions: All IDNR Office buildings, including but not limited to the Joel D. Brunsvold Building (IDNR Springfield Headquarters Building), IDNR Regional Office buildings, IDNR State Museum buildings, and any other IDNR building marked with the ISP-approved sign prohibiting firearms. All firearms, including concealed firearms, are also prohibited on all IDNR State Refuge areas, IDNR Dedicated Nature Preserves, and IDNR children playground areas. When visiting any of these locations, Concealed Carry Permit holders are required to secure their concealed firearms in their vehicle in accordance with the Illinois Concealed Carry Act.