Illinois Caverns State Natural Area is a nature preserve in Monroe County, Illinois, that features Mammoth Cave, the second-largest cave in Illinois, which has been mapped for six miles.
It features Mammoth Cave, the second-largest cave in Illinois, which has been mapped for six miles. Illinois Caverns State Natural Area is a nature preserve in Monroe County, Illinois.
Illinois Caverns State Natural Area is a nature preserve in Monroe County, Illinois. It features Mammoth Cave, the second-largest cave in Illinois, which has been mapped for six miles.
Illinois Caverns State Natural Area is a nature preserve in Monroe County, Illinois. It features Mammoth Cave, the second-largest cave in Illinois, which has been mapped for six miles.