'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 tour look in his Spring Valley Caverns in Spring Valley, Minn. Ackerman, who lives in suburban Farmington, said he got the itch to explore caves as a boy when he poked around the caves along the Mississippi River in St. Paul. Spring Valley Caverns was his first acquisition, in 1989, when he bought 600 acres of farmland. (AP Photo/Jeff Baenen)