Nominated by locals
Marengo Cave
A hidden gem in Indiana
A National Natural Landmark in the hills of southern Indiana, running guided tours past dripstone formations and crystal-lined chambers nearly every day of the year.
Build a trip around hidden gems like this.
Save catalog-backed stops to My Trips on the web now. The iOS beta is testing the on-road companion: verified check-ins, badges, shared trips, and your growing map of America.
More Indiana gems