Underworld

the Greek underworld is an otherworld where souls go after death. ... It is considered the dark counterpart to the brightness of Mount Olympus with the kingdom of the dead corresponding to the kingdom of the gods. Hades is a realm invisible to the living, made solely for the dead.

Appearance and Characteristics
The Underworld has a glorious area known as the Elysian Fields. The Underworld has the dark or murky, torturous area known as Tartarus, a pit beneath the earth, corresponding with Hell and also the home of Night (Nyx), according to Hesiod. The Underworld has special areas for various types of deaths and contains the Plain of Asphodel, which is the joyless realm of ghosts. This last is the main area for the souls of the dead in the Underworld -- neither torturous nor pleasant, but worse than life.

Tartarus
While Tartarus is not considered to be directly a part of the underworld, it is described as being as far beneath the underworld as the earth is beneath the sky.[13] It is so dark that the "night is poured around it in three rows like a collar round the neck, while above it grows the roots of the earth and of the unharvested sea."[14] Zeus cast the Titans along with his father Cronus into Tartarus after defeating them.[15] Homer wrote that Cronus then became the king of Tartarus.[16] While Odysseus does not see the Titans himself, he mentions some of the people within the underworld who are experiencing punishment for their sins.

Asphodel Meadows
The Asphodel Meadows were a place for ordinary or indifferent souls who did not commit any significant crimes, but who also did not achieve any greatness or recognition that would warrant them being admitted to the Elysian Fields. It was where mortals who did not belong anywhere else in the underworld were sent.[17]

Mourning Fields
In the Aeneid, the Mourning Fields (Lugentes Campi) was a section of the underworld reserved for souls who wasted their lives on unrequited love. Those mentioned as residents of this place are Dido, Phaedra, Procris, Eriphyle, Pasiphaë, Evadne, Laodamia, and Caeneus.[18][19]

Elysium
Elysium was a place for the especially distinguished. It was ruled over by Rhadamanthus, and the souls that dwelled there had an easy afterlife and had no labors.[20] Usually, those who had proximity to the gods were granted admission, rather than those who were especially righteous or had ethical merit. Most accepted to Elysium were demigods or heroes.[13] Heroes such as Cadmus, Peleus, and Achilles also were transported here after their deaths. Normal people who lived righteous and virtuous lives could also gain entrance such as Socrates who proved his worth sufficiently through philosophy.[13]

Isles of the Blessed
The Fortunate Isles or Isles of the Blessed were islands in the realm of Elysium. When a soul achieved Elysium, they had a choice to either stay in Elysium or to be reborn. If a soul was reborn three times and achieved Elysium all three times, then they were sent to the Isles of the Blessed to live in eternal paradise.

Access and Location
The souls that enter the underworld carry a coin under their tongue to pay Charon to take them across the river. Charon may make exceptions or allowances for those visitors carrying a Golden Bough. Charon is said to be appallingly filthy, with eyes like jets of fire, a bush of unkempt beard upon his chin, and a dirty cloak hanging from his shoulders. Although Charon ferries across most souls, he turns away a few. These are unburied which can't be taken across from bank to bank until they receive a proper burial.

Across the river, guarding the gates of the underworld is Cerberus. Beyond Cerberus is where the Judges of the underworld decide where to send the souls of the dead — to the Isles of the Blessed (Elysium), or otherwise to Tartarus.

The Lord of the Underworld

 * Hades

Judges of the Underworld

 * Aeacus
 * Minos
 * Rhadamanthys

Immortals

 * Hades
 * Persephone
 * Charon
 * Aeacus
 * Minos
 * Rhadamanthys
 * Cerberus
 * Hecate
 * Styx
 * Thanatos
 * Erinyes

Mortals

 * Ambrogio's Soul