I've always found it interesting that there was mail service between Greenland and Iceland at least up until 1424.<p>Not too long after that, in 1477, Columbus went to Galway Ireland to ask fishermen about routes across the northern sea. These fishermen routinely visited Iceland, and knew about Greenland. Columbus also inspected a boat on which a couple had arrived in Galway from beyond Iceland, likely Greenland, and either viewed the bodies of the couple or met with them depending on how you read his Latin.