The cave is located by a volcano that erupted almost 1,100 years ago...Archaeological work shows that after the lava cooled, the Vikings entered the cave and constructed a boat-shaped structure made out of rocks. Within this structure, the Vikings would have burned animal bones, including those of sheep, goat, cattle, horses and pigs, at high temperatures as a sacrifice...Near the structure, archaeologists discovered 63 beads, three of which came from Iraq, said Kevin Smith, deputy director and chief curator of the Haffenreffer Museum of Anthropology at Brown University, who leads the team excavating the cave. The team also found remains...