The Free Press, Mankato, MN

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Private Cave Owner-3

In this Oct. 10, 2013, photo, John Ackerman talks about his Spring Valley Caverns in Spring Valley, Minn. Ackerman, who has discovered various caves in the area that he is helping preserve, owns the farmland over the caverns. He holds the keys to over 40 miles of caves hidden beneath the rolling farm fields of Minnesota and Iowa, and is always seeking more. (AP Photo/Jeff Baenen)