The underworld, also referred to as hell and Hades, is located under DOA (Dead On Arrival) Recording Studios in Los Angeles, California. It's where the souls of dead people go when they die. The Underworld is divided into various sections. The Judges of the Underworld decide where a soul should go based upon their life's accomplishments. In Ancient Greek times, a man named King Radamanthus judged the dead and was later joined by King Aeacus and King Minos.
The entrance is managed by Charon, the reaper of souls. He takes them into an elevator and heads down, where they sail across the River Styx toward the opposite shore. On that shore, Cerberus, a three-headed dog born from Echidna and Typhon stands guard. The souls must pass by Cerberus toward their afterlife. Once they pass Cerberus, they cannot leave.
Door of Orpheus
The Door of Orpheus is a lesser-known entrance, which stands in Central Park, NY. Orpheus created it to retrieve the dead spirit of his wife, Eurydice. Music is required to open this door. It lets out behind the main gates, therefore being more direct to Hades' palace.
The Doors of Death
The Doors of Death act as way for Thanatos to quickly enter and exit the Underworld. However, he claims that the doors aren't in a physical place and normally only he knows where they are. Unfortunately after Thanatos was captured, Gaea managed to use the Doors of Death to allow monsters to quickly reform and souls to return to the land of the living, such as Medea, King Midas, and Phineas.
Other Entrances/Exits to the Underworld
While the above entrances are the main ways to get into the Underworld, there are other ways to get out. Hades can use the his keys to create and close gates to the Underworld almost at will. The exact locations of these entrances are unknown.
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Hades' palace is where he lives and operates his command over the Underworld. His gate is engraved with images of death and his throne is made of bones, with a flowery throne next to it for his wife, Persephone. Hades built it to resemble Olympus even though everything is black and bronze and on Olympus, everything is silver and white.
Charon's ferry floats along this river on it's way to the main gate on the Walls of Erebus. In ancient history, Achilles used the Styx to become invincible (His mother, Thetis, held him by his heel to keep him anchored to the mortal world, dipping him into the river.) Since the river is so powerful, the person bathing in it has to pick one vulnerable spot on their body to make sure they are anchored to their human life, or else they will dissolve into the river. Thus the saying "Achilles' Heel" came to be because he was defeated in his vulnerable spot, his heel. There is also a place on the human heel that is called the "Achilles Tendon", mainly because that is what scientists discovered and named with Achilles.
Once a spirit enters the Underworld, it enters the Pavilion, where three spirits judge them and put them in a certain place, according to their actions during life. One of the three judges is known, King Minos. It is mentioned William Shakespeare and Thomas Jefferson being some of the other judges. In Greek times, a man named King Radamanthus judged the dead and was later joined by King Aeacus and King Minos. Now there is a select group of judges that rotate regularly.
The Fields of Punishment
The Fields of Punishment are fields of complete and brutal torture for souls of people who have done extreme wrongs in their lifetime.
The Fields of Asphodel
Souls who don't wish to be judged go the Asphodel Fields. According to some, it is described as "standing in a wheat field in Kansas for eternity." Also for people who are judged and who have not done enough good or bad in their life end in Asphodel as some stated that "most people don't do good or bad in their life." Most souls forget their lives when they are in these fields.
Elysium is the place of paradise for heroes. Those who die a hero's death live in peace in Elysium. In the middle of the lake, is the Isles of the Blest.According to some, the only part of Elysium that can be seen behind its locked gate are several houses from different time periods. The grass ripples in rainbow colors and it is possible for one standing outside the gate to hear laughter and smell barbecue cooking.
Isles of the Blest
The Isles of Blest is reserved for heroes who have chosen to be reborn three times, each time achieving Elysium. Not many people live in the Isles of the Blest, and not many will, as there are not a lot of people who do good in their life. It is described as a glittering blue lake with three small islands like a vacation resort in the Bahamas.
Tartarus is the darkest and deepest area of the Underworld. Tartarus is where the gods imprison their enemies, chiefly the Titans. Kronos is known for being held there. When a monster is slain, its essence is sent to Tartarus until they can reform.
Tartarus is the lowest region of the world, as far below earth as earth is from heaven. Tartarus is described as a dark, gloomy pit, surrounded by a wall of bronze, and beyond that a three-fold layer of night. According to the Iliad, it is a 9-day anvil fall from the other regions of Hades.
The River Lethe
The River Lethe is the River of Forgetfulness, and it is used on people who try for rebirth. It has pure black water. According to some, it is strong enough to wipe the mind of a Titan. Even one drop can make people start to forget who they are.