Before it got colder, the Vikings also built at least one settlement in Labrador, in NE Canada.
Archaeologists discovered Viking artifacts in Labrador a couple years ago, which I think I also posted on Free Republic.
They were there, and left behind some Viking kitties, part of the ancestry of the Maine Coon Cat.
http://www.google.com/search?q=L%27Anse+aux+Meadows+site:freerepublic.com