They appear to have had two long-lasting communities in Greenland, and a site has been found at L'Anse aux Meadows in Newfoundland.
But is there any solid evidence that the Vikings had a more extensive presence in pre-Columbian North America?
If there was a Viking presence in North America, it has not been documented. And the doings of the "western" (Norwegian) Vikings are fairly well documented. What would be accurate illustrations of vikings and viking culture?
One of the issues is that the Vikings didn't "know" that they had "discovered" (or were close to discovering), a new continent. To them, Newfoundland (an island) was just another Greenland or Iceland, somewhere in the Atlantic Ocean, with no particular relevance to anything else.