Couple of interesting facts about the caves...
In the 1950's, folks thought the cave would make a good fall-out shelter. So they packed a bunch of food and medical supplies and about 1100 people in the cave as a test. Turns out, the limestone is so porous that it wouldn't protect anybody from a nuclear or chemical attack. They left all the food and supplies down in the cave and abandoned the idea of using it as a fall out shelter.
There is a pool of water in the cave that the guide says is 99% pure. They use the water to fill the olympic size swimming pool at the park.

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