Viking Ships Museum, Copenhagen, Denmark -- What an absolutely beautiful design.
Viking Museum, Roskilde, Denmark
View from Roskilde Viking museum in Denmark. Besides being a museum, they also build and sail shipes in the local fjord where many of the old ships were found. The fjord is an ideal temperature to preserve the wood from the ancient ships. I have been lucky enough to live just blocks from here as a child, and participated in some of the school projects for children.