The enormous palace was modeled after Mount Olympus, as Hades is not welcomed there except on the Winter Solstice. It is made of glittering black obsidian, with a black marble portico, and the entry hall had a polished bronze floor. The palace is guarded by the skeletons of dead soldiers from different wars that have been around the world, such as The Second World War. When Percy compared Hades' palace to Olympus, he noted that the former was black and bronze, while everything in the latter glittered silver and white.
In Percy Jackson's Greek Gods, it was mentioned that the palace had entire rooms made of gold and silver, decorated with bouquets of flowers made of precious metals and jewels, since Hades is also the God of Wealth, with access to all the riches under the earth. The splendor of these chambers was enough to awe even Persephone, who had never seen "such dazzling wealth" even on Mount Olympus itself.
In front of the palace is Persephone's Garden, which has been said to be one of the most beautiful gardens on Earth. A person can only reach the palace if Hades wishes them to. If he does not, the person will just keep walking for eternity without ever reaching it.
- The Throne Room – Hades sits upon a huge black onyx throne decorated with many skulls, surrounded by dead U.S. revolutionary soldiers, British Redcoats, Greek warriors, Roman Legionnaires, Modern U.S. soldiers, and Confederate soldiers (as security). He is also surrounded by hellhounds. It appears in Percy Jackson's Greek Gods, Percy Jackson's Greek Heroes, The Lightning Thief, The Sword of Hades, and The Last Olympian.
- The Dungeon – Hades imprisons Percy Jackson here in The Last Olympian. The cells do not have any doors or windows, and apparently no source of oxygen for living prisoners.
- Nico's room – Hades orders Nico di Angelo to go to his room in The Last Olympian. It is only mentioned, however.
- Persephone's Chambers – In The Sword of Hades, Hades threatens to lock Persephone in her chambers for disobeying him. She continued to have a sword made after Hades did not approve its creation. She is mentioned cheating on her husband with Adonis in these chambers in Percy Jackson's Greek Gods.
- Preciously Decorated Halls - As seen in Percy Jackson's Greek Gods, Hades' palace has several magnificent halls made entirely of pure gold and silver, decorated with bouquets of flowers made of precious metals and jewels, due to Hades also being the god of wealth (with access to all of the precious metals and jewels under the earth). A very impressed Persephone admits to never having seen "such dazzling wealth" even on Mount Olympus itself.
Percy, Annabeth Chase, and Grover Underwood visit to diplomatically ask Hades to give them Zeus' stolen Master Bolt. Hades is found sitting on his throne, facing away from the three heroes. They later make a hasty retreat using Poseidon's Pearls.
Thalia Grace, Nico, and Percy are summoned to the palace by Persephone to retrieve Hades's Sword which was stolen by Ethan Nakamura. They are first summoned to Persephone's Garden then they are brought to a veranda overlooking the garden. After retrieving the sword, the group return to the palace to return the sword to Hades and Persephone. Percy and Nico talk on a balcony overlooking the Fields of Asphodel where Nico reminds Percy of his idea to make Percy immortal by bathing in the River Styx. Percy promises to think about it. Thalia and Percy say goodbye to Nico, whom chooses to remain in the Underworld to advise Hades in the coming Titan War.
When Percy went to the Underworld with Nico to bathe in the River Styx, Nico revealed that he had tricked Percy to come with him, in order to get information from Hades about Nico's past and his mother. He hands Percy over to the Furies, who take Percy to Hades palace. Hades talks with him for awhile then sends him to the dungeon, a place below the palace. The dungeon is guarded by ghostly warriors and other dead beings. Percy is held there for a short time until Nico shows up to rescue him. They escape from the dungeon, and make their way to the River Styx so that Percy can bathe in it and gain the Curse of Achilles.
- Percy visited the palace three times in the series and escaped alive: The Lightning Thief, The Demigod Files, and The Last Olympian.
- Demeter highly disapproves of Persephone living there with Hades because she claims there is not enough cereal for what she considers a proper breakfast.
- The palace is run by skeleton servants.
- Nico di Angelo has a room in the palace.
- In Percy Jackson's Greek Gods, it was mentioned that the palace had entire magnificent halls made of pure gold and silver, since Hades is also the god of wealth, with access to all the riches under the earth.
|Underworld:||DOA Recording Studios | Doors of Death | Door of Orpheus | Elysium | Erebos | Fields of Asphodel | Fields of Punishment | Hades' Palace | Isles of the Blest | Judgment Pavilion | Persephone's Garden | River Lethe | River Styx | River Acheron | River Phlegethon | River Cocytus|
|Tartarus:||The Mansion of Night | Hermes' Shrine|