Nidavellir

It was the home of the Dwarves (or Dark Elves?), located in the middle level of Ygdrasil's three levels of worlds.

"Northward a hall | in Nithavellir
Of gold there rose | for Sindri's race."
(Völuspá)

Click Here for more info about "The Nine Worlds", connected by the World-Tree Ygdrasil.

Old Norse: Niðavellir
Meaning: "The Dark Fields"