A tourist attraction dating back more than a century, the Illinois Caverns is the second largest cave in the state. In 2010, officials closed the cave to the public in an effort to slow the spread of white-nose syndrome, a fungus that kills bats. Last month, the Illinois Department of Natural Resources announced the cave would reopen after more than a decade. Now, visitors can once again don hard hats and wade through an underground stream to explore the cave’s geological treasures.