'It's really an underground paradise. It's unbelievable down there'

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Private Cave Owner
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Private Cave Owner
In this Oct. 10, 2013, photo, John Ackerman gives a closeup look at his Spring Valley Caverns near Spring Valley, Minn., looking back to the place where he plans to be buried when he dies. Ackerman has discovered various caves in the area that he is helping preserve. (AP Photo/Jeff Baenen)