underworld
supernatural realm, usually beneath the earth, in various mythologies
Tuonela
realm of the dead or the Underworld in Finnish and Estonian mythology
World of Darkness
underworld in Mandaeism
Sheol
underworld in the Hebrew Bible
Ancient Mesopotamian underworld
underworld in Sumerian culture
Greek underworld
location in Greek mythology
Kur
demon
Elysium
afterworld for good souls in Greek mythology