In Norse mythology there are 9 worlds that are divided among three levels:
Asgard (Aesir, the land of the gods),Alfheim (elves),Vanaheim (Vanir),
Midgard (men),Jotunheim (giants),Svartalfaheim (dark-elves),Nithavellir(dwarves),
Muspelheim (fire, a bright, flaming, hot world in the southern region), andNiflheim (the dead, the lowest level)
all held together by the world tree, Yggdrasil. But the nine worlds and Yggdrasil were not there in the beginning.