If you've already visited Marengo Cave and are looking for more unique, must-visit destinations in Indiana, you’re in luck. Here are five more places you have to see to believe:

Sullivan Cave
Sullivan Cave, the fourth-longest cave in Indiana, is one of thousands of wild caves in Indiana that are best explored with experienced cavers. Joining a local caving club, called a grotto, is a great way to find out if you want to become an experienced caver. The National Speleological Society helps adventurers find local caving clubs in every state, including Indiana. Indiana’s commercial caves also offer “wild” caving tours in the noncommercial sections of the caves.


