Pick up a passport at any of the four participating caves.
Each cave stamps your passport when you purchase tickets.
At the 4th cave, you will receive your Subterranean Club Patch!
Indiana Caves
Join Our Subterranean Club
By touring all four of our beautiful caves, you will automatically be eligible to become a member. This is the best way to experience underground Indiana, and joining is as easy as one, two, three! Your name will also be entered into a drawing for a weekend getaway package.
If you're staying overnight in the area, we recommend Spring Mill Inn. Show your inn receipt at any of the four caves and receive a discount. A coupon is available for your stay as well.
