He was the type of guy who had lots of stories and interesting facts about all sorts of various topics.
One time he told a story about Vikings sailing up the Mississippi. I thought that was interesting but couldn't find anything when I googled it. I know that others had sailed to the Americas before Columbus but I couldn't find anything about going up the Mississippi.
Is there history that supports this or was it just a cool story?
This has been somewhat answered by another question here: https://www.reddit.com/r/AskHistorians/comments/1jlsc5/why_didnt_the_vikings_travel_farther_south_than
And as far as I know as someone who has worked with materials from cultures along the Mississippi River, we have zero evidence of any Vikings sailing up the Mississippi. Obviously you can't 100% prove something didn't happen, but I can say with certainty that there is no evidence to support a theory that Vikings made there way up the Mississippi, or even past New England as the link discusses.