From Copenhagen, you can take a train straight into the world of Vikings.
That’s what happened when we got off at Roskilde and walked to the Viking Ship Museum on the shore of the Roskilde Fjord. This location is pertinent because five Viking ships were discovered in its frigid water and now ship remains are now on display in the museum.
Plan to spend at least half a day learning about Viking ship building, seafaring voyages, trade routes, the significance of the ships for Viking society and the retrieval of the wrecked ships from the fjord. Hang out in the boatyard to watch shipwrights as they reconstruct full-scale ships using the methods of the time.
NOTE: If you just happen to find a Danish shipwreck or other submerged maritime archaeological site older than 100 years (from the time of wrecking), you must report the find to the appropriate museum.