The Vikings were some of the only people that continued sea exploration during the Dark Ages. While many societies became less advanced, the Vikings kept moving forward. They were actually the first Europeans to discover North America.
Leif Erikson Day honors a viking explorer known as Leif Erikson. He is believed to be the first recorded Nordic person to have visited North America. It is believed that he visited places such as Baffin Island and Labrador around 1000 CE.