The Fram Museum at Bygdøy houses the world's strongest wooden ship, the polar vessel Fram, which made three historic expeditions between 1893 and 1912. You can board the ship and walk through the living quarters where Nansen, Amundsen, and their crews spent months locked in Arctic and Antarctic ice. The museum building is designed around the ship, so the Fram sits inside it.
The museum tells the story of three expeditions in compelling detail: Nansen's 1893–1896 Arctic drift (which held the record for furthest north), Otto Sverdrup's 1898–1902 Canadian Arctic voyage, and Amundsen's 1910–1912 race to the South Pole. The Gjøa, Amundsen's smaller vessel in which he first navigated the Northwest Passage, is also on display outside. One of the best museums in Oslo and often less crowded than the Viking Ship Museum.