This videos captures part of the connection story that made the Binkley Cave System by far the longest cave in Indiana (11th in the United States).
Tours leave frequently throughout the day. You must arrive no later than 4pm EDT on weekdays and 4:30 on Saturday and Sunday to be guaranteed a spot on the last tour of the day. The cave temperature is 56 degrees all year. Weather is never a problem.
Closed only on Thanksgiving and Christmas Day.