Marengo Cave
Marengo, IN · Indiana Cave Country$$
Two schoolchildren stumbled into Marengo Cave on a September afternoon in 1883, and tours have run almost without pause ever since, which makes this one of the oldest show caves…
An electric boat takes you a mile and a quarter along the Myst'ry River in Bluespring Caverns, 5 miles southwest of Bedford, Indiana. Boats leave at least hourly from 9 to 5, every day from March 16 through October 31. You can't reserve, so late-afternoon tours can fill on busy weekends, and flooding or a sudden rain can cancel them. The hour-long tour includes a 400-foot walk and isn't wheelchair accessible. Up top, a half-mile trail loops around Indiana's largest karst plain sinkhole, which is more than 90 feet deep and covers ten acres.