I can’t recall where I read something like this article,sorry. Yggdrasil can be found at https://en.wikipedia.org/wiki/Yggdrasil

Yggdrasil was basically the tree of the cosmos with 9 planets connected to it with different peoples on each. If you saw the “Thor” movies by Marvel they featured it in some of them. They also featured it in the first “Captain America” film, right at heh beginning.