Many students of archaeology share an experience: they once took a class in which the professor compared archaeology to detective work.
Vikings in the New World: A New Phase of Investigation
It seems to me that there are several phases in the reporting and investigation of Viking sojourns in North America....
Interest in Viking voyagers has even touched New York State, with various claims of Viking evidence from the vicinity of Lake Ontario (reachable, with determination, by longboat) to Lake Chautauqua (which would have required some pretty extreme portages).