600-year-old Viking shipwreck is the largest of its kind

The medieval'cog' was nearly 92 feet long and featured castles on its bow and stern. Breakthroughs, discoveries, and DIY tips sent every weekday. Archaeologists in Denmark say a sunken Viking ship near Copenhagen is the largest boat of its kind ever discovered--and that's saying something. At nearly 92 feet long, the 600-year-old vessel is also one of the best preserved examples of a cog, a "super ship" whose advanced design and carrying capacity helped transform trade in medieval Europe. "The find is a milestone for maritime archaeology," excavation lead Otto Uldum said in a statement, adding the boat now offers a "unique opportunity to understand both the construction and life on board the biggest trading ships of the Middle Ages."