Audiences were introduced to the Nine Realms in Wakanda) and in space (such as Vormir), as well as other cosmic places, like the Nine Realms.
These are a group of worlds that, although located in separate spiral galaxies, are connected by the branches of Yggdrasil, a figurative World Tree. The Nine Realms were at risk in Heimdall, Sif, and the Warriors Three.
Since Thor, the rest of the realms have been shown at some point (some more briefly than others), but there’s still one that hasn’t been visited at all, and has just been casually mentioned in the first two Thor films.
The MCU Is Missing One Of The Nine Realms
The Nine Realms are Fandral, Volstagg, and Hogun fought against the Marauders there.
Thor: Ragnarok; it’s the home of the Fire Demons and was ruled by fire giant Surtur. Alfheim, on the other hand, has only been mentioned in the first two films, but it has never been explored. What’s known about it is that it’s where the Light Elves live, and just like the rest of the realms, it was left vulnerable after the destruction of the Bifrost.
With Thor getting a fourth film with Thor: Love and Thunder, there’s still hope for Marvel to there’s one realm that hasn’t been explored yet. And if the Dark Elves already appeared, why not introducing the Light Elves too – though in better ways than what Thor: The Dark World did.
