Hades is the Greek god of the underworld and the dead.

Duat is the Egyptian underworld, where the dead travel to after death.

Helheim is the Norse underworld, ruled by the goddess Hel.

Annwn is the Celtic underworld, where the dead travel to after death.

Mictlan is the Aztec underworld, where the dead travel to after death.

Xibalba is the Mayan underworld, where the dead travel to after death.

Naraka is the Hindu underworld, where the wicked are punished after death.

Naraka is the Buddhist underworld, where the wicked are punished after death.

Diyu is the Chinese underworld, where the dead travel to after death.

Yomi is the Japanese underworld, where the dead travel to after death.

Yomi is the Shinto underworld, where the dead travel to after death.

Druj Nasu is the Zoroastrian underworld, where the wicked are punished after death.

Narak is the Sikh underworld, where the wicked are punished after death.

Naraka is the Jain underworld, where the wicked are punished after death.

The World of the Dead is the Baha'i underworld, where the dead travel to after death.