Svartalfheim

Svartalfheim is one of the Nine Realms and home of the Dark Elves

Thor: The Dark World
Hundred years ago BC, Svartalfheim was the site of the final battle between the Dark Elves and Asgardians. The Asgardians sought to stop Malekith, the leader of Dark Elves whose purpose was to use the Aether plunge the universe into a eternal darkness. During the battle, Asgard ripped the weapon from his grasp; without it, the Dark Elves fell. With the battle all but lost, Malekith sacrificed his own people in a desperate attempt to lay waste to Asgard's army. Malekith and other dark elves put themselves into a state of hibernation.

In 2013, Malekith and the others awoke from their hibernation after Jane Foster found the Aether. When he saw the destruction on his planet, Malekith vowed take revenge on the Asgardians. Thor, Jane and Loki went to Svartalfheim to prevent another attack from Malekith to Asgard. Malekith managed to remove the Aether from Jane and headed to Earth, leaving Algrim fighting Thor. During the battle, Loki pretended to die in order take the throne of Asgard during Thor's absence. Malekith and Thor were teleported to Svartalfheim during their fight due to the phenomena caused by the Convergence. Later, Malekith was teleported here, minutes later his ship too, which crushed him to death.