Helheim or Hel, is known as the realm of death and is in the deepest, darkest and dreary part of Niflheim, one of the nine worlds of the Yggdrasil, in Norse mythology. Helheim and Niflheim usually relate as the same world, but this is not so: Niflheim is the kingdom of cold, ice and darkness, mainly, and, although they are also their own, death and perdition, where these occur The last two specifically is in Helheim, the capital of death (so to speak).

In this world ended those who had died of disease or old age, and once entered it even the gods could not leave, because of the endless, inexhaustible and impassable Gjöll River, which surrounded it.

Of course all criminals will go to Helheim, but for these there are special areas within the Helheim.

Soundtrack: https://www.youtube.com/watch?v=fnb1y96glDM