It was completely appropriate. Aside from it pulling on Cap's own mythology, it's covered with the sort of death/rebirth symbolism that one finds in fairy tales, or sacrifice in return for some other gain (and strangely, it's extraordinarily appropriate that it would happen in Fury's scene, I guess because he's got a certain Odin-like air about him--one eye, wisdom, war, leadership, cunning, knowing all sorts of things he shouldn't).

Speaking of which, the tomb did kind of remind me of Tolkien--and also vikings and thus Thor. :)

There was a touch of King Arthur there, too, between the bier and the sword, which seemed fitting since Cap's always had echoes of Arthur--or maybe that's just me.