The Viking Ship Museum at Bygdøy holds the three best-preserved Viking Age ships in the world — the Oseberg, Gokstad, and Tune ships, all burial vessels found in Norwegian burial mounds. The Oseberg ship in particular is extraordinary: a beautifully preserved 9th-century vessel whose carved prow and intricate woodwork make it the finest surviving example of Viking craftsmanship anywhere.
Note: The museum is closed for a major expansion (reopening 2027 as the Museum of the Viking Age). The new facility will have significantly more space for the ships and their associated grave goods. Check the museum website before visiting, as temporary exhibitions may be running during the construction period. The Bygdøy peninsula itself is worth reaching by ferry from Aker Brygge — the Kon-Tiki Museum, Fram Museum, and Norwegian Folk Museum are all nearby.