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    In this cavern there are bats, secrets, and a zip line

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In this cavern there are bats, secrets, and a zip line

One of the world's coolest unknown places is right in the middle of Louisville, Kentucky ... you just have to know where to look. CNNMoney's Vanessa Yurkevich visits Mega Cavern, home to the world's only fully underground zip line course.

In this cavern there are bats, secrets, and a zip line

One of the world's coolest unknown places is right in the middle of Louisville, Kentucky ... you just have to know where to look. CNNMoney's Vanessa Yurkevich visits Mega Cavern, home to the world's only fully underground zip line course.