Hades is the Greek god of the underworld, and his realm is also referred to as Hades.

Duat is the ancient Egyptian term for the underworld, where the souls of the dead journeyed after death.

Helheim is the realm of the dead in Norse mythology, ruled by the goddess Hel.

Cerberus is a three-headed dog that guards the entrance to the Greek underworld, preventing the dead from leaving and the living from entering.

Dante's "Inferno" depicts the underworld as having nine circles, each representing a different level of punishment for sinners.

In the Egyptian underworld, the heart of the deceased was weighed against the feather of Maat, the goddess of truth and justice, to determine their worthiness for the afterlife.

Annwn is the Welsh name for the Celtic underworld, a realm of mystery and magic.

Irkalla was the Mesopotamian underworld, ruled by the goddess Ereshkigal.

Yomi is the Japanese underworld, where the spirits of the dead reside.

The Aztecs believed that the underworld, known as Mictlan, was a place of eternal darkness and punishment for those who had committed sins in life.

The river Styx is the boundary between the world of the living and the underworld in Greek mythology.

Hun-Came and Vucub-Came are the lords of Xibalba, the Mayan underworld.

Anubis, the Egyptian god of the dead, is often depicted with the head of a jackal.

The ancient Egyptians believed that the underworld was a place of judgment and purification, where the souls of the dead were weighed against the feather of Maat to determine their worthiness for the afterlife.

Cerberus guards the entrance to Hades, the Greek underworld.