2. The Wilderness (Wisconsin Dells, WI)

The Wilderness makes this list because it began the indoor water park movement and earns  Wisconsin Dells the deserved title of the Water Park Capital of the World. The indoor park is over 250,000 square feet, and the seasonal outdoor park together make it the world's largest private water park. The Wilderness is only available to guests of its massive resort to lessen wait times. This allows riders to truly enjoy the park.


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