Caves of Illinois Rock Springs Nature Center Thursday, Jul 21, 20226:00 pm Join guest speaker John Schirle as we learn about the science of caves, where you can find them in the state, and what lives in them. There will be a special focus on exploring Illinois Caverns, an IDNR-managed ‘wild cave’. Free. Register online by July 20. Loading Map.... Rock Springs Nature Center3939 Nearing Lane - DecaturEvents 39.8238186 -89.0116112