Step 1 Pick up a passport at any of the four participating caves.
Step 2 Each cave stamps your passport when you purchase tickets.
Step 3 At the 4th cave, you will receive your Subterranean Club Patch!
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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.