I recently visited the Children's Museum of Indianapolis for a series about the Dinosphere at Love in the Time of Chasmosaurs. While the Dinosphere is certainly worthy of all of the attention it gets, local natural history also gets some space. Here's a cool thumbnail version of Indiana's bedrock geology. It was overshadowed by the climbing wall next to it, so if you happen to visit with your kids, take a second to show them what's happening under their feet.
They also have this gorgeous slab of Borden limestone on display, featuring some nice crinoids from Crawfordsville.