Hall of the Gods

The Hall of the Gods is the largest room on Olympus. It is also where the gods' thrones are located and where all formal and war councils meetings are held.

Description
The Hall of the Gods is the place where the gods have their summer and winter solstices. High above, the blue ceiling can be seen glittering with constellations. The Thrones of the gods stand in a U or at least it did before the minor gods, and Hades received thrones (just like the Camp Half-Blood cabins before the children of minor gods and Hades were claimed and got cabins) around the hearth starting with Zeus and Poseidon's thrones as they are the most powerful Greek gods. Hades does not have a throne on Olympus due to the fact that his throne resides in the Underworld, but when he comes to Olympus, there is a guest throne that he occupies (he may have a throne now). From Zeus and Poseidon's thrones the goddesses sit on the left side of the hearth and the other gods sit on the right side. In one corner, a house-size globe of water hovering in the air and inside it is the Ophiotaurus (who Percy named Bessie), half-cow, half-serpent. Hestia's hearth is in the center of the Hall. In The Titan's Curse, Percy wonders how it doesn't blow up with all the powerful gods inside. Percy describes it as being the size of Madison Square Garden and making Grand Central Station look like a broom closet.

The Lightning Thief
The throne room is first seen when Percy Jackson returns Zeus' lightning bolt and explains to Poseidon and Zeus that Ares was responsible for the bolt being missing for so long.

The Titan's Curse
The throne room is seen again on the Winter Solstice. The gods agree to take action against Kronos' rising forces, but Ares makes it clear that Thalia Grace and Percy are threats to Olympus. However, this changed when Artemis makes Thalia her new lieutenant, leaving Percy to bear the prophecy. The gods vote not to destroy the two demigods and to protect the Ophiotaurus, which could be used to empower the enemy and bring about the downfall of Olympus.

The Last Olympian
Percy leads his fellow campers to the Empire State Building to speak to Zeus about protecting Olympus against Kronos (who possessed Luke Castellan's body at that time), but they find that the Olympians have gone to fight Typhon. There is only Hestia left, but Hermes arrives with messages from Athena: the demigods are on their own, and that Percy was to stay away from her daughter, Annabeth. Hermes was angry with Annabeth, causing Percy to infuriate him even more. Percy only escaped death because George and Martha told Hermes that Percy bared the Curse of Achilles. The demigods use Olympus as their war base in the battle against Kronos. Rachel Elizabeth Dare goes there during the battle for safety and came across Pandora's Pithos and Hestia, who shows her that she must let go of what was holding her back from her destiny, Percy. Percy gives Hestia the pithos for safety and climbs on Poseidon's throne to get his attention. Poseidon was angry, but listened to his son's story of the events in Manhattan and reluctantly agreed to abandon his battle against Oceanus to fight Typhon with the other gods.

Eventually, Kronos gets past the campers, Hunters, and centaurs to Olympus and destroys the entrance of Olympus. Percy, Annabeth, and Grover reach the throne room just as Kronos was deciding which throne to destroy first. He battles Percy, but gets electrocuted by Hephaestus' throne. Ethan Nakamura betrays Kronos and dies for it. Grover uses nature magic to grow grass on the floor and Kronos freezes time around Percy. He uses an Iris message to show Percy the Olympians' defeat, but is infuriated when Poseidon arrives with his army of cyclops and merpeople to defeat Typhon. The arrival of Poseidon gives the other gods renewed hope and they finally overthrow Typhon, sending him to Tartarus.

Annabeth fights Kronos and gets through to Luke to fight Kronos long enough to stab his Achilles heal (his left armpit) and defeat Kronos. Luke dies as the Olympians arrive to fight Kronos, but they find Percy, Annabeth and Grover over Luke's body.

Hades and his son Nico di Angelo fought in the Battle of Manhattan and were greeted warmly in the throne room (a first for Hades). Hestia sits by the fire and Hades sits on a guest throne. Tyson, Poseidon's cyclops son, is made a general in the Olympian army, Grover is made a Lord of the Wild and no longer exiled, Annabeth is made Olympus's architect, and Percy is offered a great gift: immortality; he would be made a god and be his father's lieutenant.

Percy turned down the offer, but made the gods swear on the River Styx to never forget their demigod children, because some demigods had gone over to the enemy because they felt abandoned by their parents. They were to be claimed by the age of 13, and the minor gods (Hebe, Nemesis, Hecate, Morpheus, etc) were to be given cabins at camp so their children would not be forgotten either; Percy even said Hades should have a cabin there for his own children (and Hades momentarily thought Percy implied that he was a minor god). Percy also declared that the pact of the Big Three (Zeus, Poseidon, and Hades) was to be removed; they should not ban powerful demigods, but accept them and train them at camp. The gods agreed, and as Percy leaves, his father proudly gives him an honor guard.

Thrones

 * Zeus' Throne is the throne Zeus sits on in the Hall of the Gods. It is made of platinum and has lightning designs on the sides, also made of Platinum. It's also known as the middle throne inside the Hall of the Gods.
 * Hera's Throne is where the goddess Hera sits on in the Hall of the Gods. It has the picture of a willow and peacocks on it. It is made of ivory.
 * Poseidon's Throne is where Poseidon sits on in the Hall of the Gods. It is decorated with corals and has a built-in holster for a trident. It is described as a deep sea fishing chair or swivel chair. It is much less grand than Zeus' Throne. Percy once sat at it trying to communicate with his father in The Last Olympian during the Battle of Manhattan on Olympus and he felt the power of sea at his disposal. Poseidon's Throne is on Zeus' left hand side.
 * Demeter's Throne is where Demeter sits on in the Hall of the Gods. It is woven of apple-tree branches, wheat stalks, and dried grass. It has a small yellow seat cushion to sit on. It was possibly damaged during the fight with Kronos, but there is no proof.
 * Ares' Throne is where Ares sits on in the Hall of the Gods. The throne is made of leather and chrome like his bike with large human skulls built into the arms. He sat on a cushion made of human skin. During the Battle of Manhattan it was damaged during the fight between Percy and Kronos in the Throne Room. Ares sits crookedly on his throne.
 * Athena's Throne is where Athena sits on in the Hall of the Gods. Athena's throne is silver with golden basket-work on the back and sides. There is a crown of violets above. It's unknown if it was damaged when Kronos was destroying the Hall of the Gods.
 * Apollo's Throne is where Apollo sits on in the Hall of the Gods. It is a golden throne. It represents the sun, healing and poetry. The golden throne has magical inscriptions carved all over it. The back of the throne is shaped like a lyre, and has a python skin to sit on (see Python or Oracle of Delphi). There is a sun disk above with twenty-one rays made of arrows.
 * Artemis' Throne is where Artemis sits on in the Hall of the Gods in Mount Olympus. Artemis has a throne of pure silver. It has two date palms on the back, full moons above, she sits on a wolf-skin cushion and probably some skins unknown to Percy that he saw in The Titan's Curse. It is unknown if her throne was damaged when Kronos attacked Olympus.
 * Hephaestus' Throne is where Hephaestus sits on in the Hall of the Gods. It is a mechanical La-Z-Boy chair that has a defense system which Percy triggered while fighting Kronos in The Last Olympian. It shot tendrils of electricity in all directions. It is believed that it is some what similar in design to the Hephaestus cabin at Camp Half-Blood.
 * Aphrodite's Throne is where Aphrodite sits on in the Hall of the Gods. Aphrodite's throne is silver and inlaid with aquamarines, beryls and other precious stones. The back is shaped like a large seashell and the seat is made from soft swansdown (swans are symbols of Aphrodite and she rose from the sea foam created from Ouranos' blood). It is unknown if her throne was damaged.
 * Hermes' Throne is where Hermes sits on in the Hall of the Gods on Olympus. His throne is made of gray rock. It has ram's heads on the arms and he sits on a cushion of goatskin.
 * Dionysus' Throne is where Dionysus sits on in the Hall of the Gods. It is made of grape vines and he sits on a leopard skin cushion (his symbol). It was previously occupied by Hestia.