L’Anse aux Meadows is currently the only confirmed Norse site in North America. It represents the farthest-known extent of European exploration and settlement of the New World before the voyages of Christopher Columbus almost 500 years later. – Wikipedia
It took a Norwegian archaeologist husband-and-wife team to figure it out and to do the excavations that proved the point: Almost 500 years before Columbus, the Vikings established a site in what is now the island of Newfoundland. It didn’t last – something about conflict with the locals – but they actually lived there for a few years. It’s also a UNESCO World Heritage site.