After thor's death check out lunda's shop area in alfheim where you can find a secret scene. Look near the desert sands to trigger a sequence where thrud, thor's daughter, claims mjolnir. You won't be able to use the hammer yourself but watching thrud lift it and fly away is worth seeing, especially since it sets up her future as a valkyrie trainee.

Tip: This scene only becomes available after completing the main story, and you'll need to specifically search the area around the shop for the trigger point. The moment where she says "i'll make you proud, dad" is pretty significant for the story and worth tracking down, even if you've finished everything else.