Denmark
The main attraction is five Viking ships excavated at Skuldelev. Exhibits explain how Vikings lived and worked, with a special focus on how they built their ships. A workshop demonstrates how the ships are restored.
Sweden
A fantastic museum featuring the Vasa, a ship built in the 17th century that sank in Stockholm harbor on her maiden voyage in 1628. The ship was salvaged 333 years later and is still being renovated and restored. At the museum you'll see the Vasa yourself, as well as exhibits about how the ship was built, how sailors on lived on similar ships in the 1600s, and other topics related to maritime history.
Norway
A museum with a collection of 3 Viking ships from the 10th century. Two of the ships are remarkably well preserved—almost completely intact—while one is missing about half its structure. The ships were used in ceremonial burials, so they sank with numerous gifts and artifacts.