Camp Half-Blood

Camp Half-Blood is a secret Greek demigod training facility located on Long Island behind Thalia's tree before the Golden fleece turned he back into a demigod. It's directed by Dionysus (who is called "Mr. D") and Chiron the centaur. It is also the Greek counterpart of Camp Jupiter in San Francisco, California.

The camp has magical borders which are enforced by the Golden Fleece, which was found by the satyr Grover, the Cyclops Tyson, and demigods Percy Jackson, Clarisse La Rue, and Annabeth Chase. Taken from Polyphemus' island it was placed on Thalia's pine tree, ensuring that no monsters could gain access to the camp. In earlier years, it was a pine tree made from Thalia, a daughter of Zeus. After almost being killed by monsters, Zeus pitied her but wanted to keep her alive so he turned her into a pine tree, making it so she wouldn't die. Her tree became the official borders of Camp Half-Blood. The Fleece stayed on the tree, guarded by a dragon (Peleus), protecting the camp.

The camp is described as being the only safe haven for half-bloods, although in The Lost Hero it is revealed that there is a camp for Roman demigods which is revealed in The Son of Neptune to be called Camp Jupiter.

The half-bloods live in cabins (one for each Olympian god and goddess, though many more cabins were added later for the minor gods and goddesses because of Percy's request), and eat at the dining pavilion. There is also an archery field, a sword fighting arena, a climbing wall with lava for training, an amphitheater, stables, an armory, and the Big House.

Its cover name is Delphi Strawberry Service, a reference to the name of the Oracle of Delphi.

Address
Camp Half-Blood, Half-Blood Hill, Farm Road 3.141 Long Island, New York 11954

The address is located in "The Sea Of Monsters" in chapter 19. The camp is in Montauk, at the end of the Long Island. It is in Montauk because the zip code is 11954, the zip code for some areas of Montauk, Long Island. Also, Percy, Sally, and Grover drive from their cabin at the beach in Montauk and it does not take them very long to get to camp. However, the Camp is located on the North Shore of Long Island, referenced many times in the books, and Montauk is located on the South Shore. This makes the camp's true location uncertain. Percy also says that the part of Long Island beach that the camp is on is invisible to mortals. The address, 3.141, is believed to have originated from the number pi, which is named after a Greek letter.

The main entrance of the camp is through Half-Blood Hill, mentioned in the Lightning Thief (book).

History
According to various camp members, the camp has trained some very famous figures, possibly including a couple of United States Presidents (ex. George Washington, son of Athena and Harriet Tubman, daughter of Hermes). It is a sanctuary for demigods, with borders that keep out monsters as well as humans. Five years before Percy arrived at the camp, Thalia Grace - a daughter of Zeus - came close to dying on the border, willing to sacrifice herself to allow her friends - Annabeth Chase, Luke Castellan, and Grover Underwood - to reach the safety of the camp. In her dying moments, her father took pity on her and turned her into an enormous pine tree, sustaining her life-force within the tree. Her tree's position on the border enabled her spirit to strengthen the borders of the camp, even as she did in her final moments. She later returned to human form and joined the Hunters of Artemis. It was also mentioned in The Demigod Files that before the camp had magical borders, it was guarded by the Bronze Dragon about 15 years before it became defective and disappeared into the woods. It was said that the bronze dragon was an offering of the Hephaestus cabin to their father and that it protected the camp for about a decade before getting lost.

The Lightning Thief
In The Lightning Thief, Percy Jackson, Annabeth Chase, and Grover set off to the west coast to recover Zeus' main weapon, the master bolt, which was made by the Elder Cyclopes for Zeus before the summer solstice or else Zeus and Poseidon, Percy's father, would go to war. In the end, however, Percy returns to camp a hero and the campers celebrate. However, after awarding Percy his first camper bead, Luke Castellan betrays everyone by joining Kronos, Titan Lord of Time, and attempts to poison him with a pit scorpion. Percy, however, survives the encounter, but not before Luke can escape.

The Sea of Monsters
The Sea of Monsters features a quest to retrieve the Golden Fleece after Thalia's Tree is poisoned by Luke, who used elder python poison from the depths of Tartarus, and the protection was fading. The Fleece, which can make any land a paradise, heals Thalia's tree from near-death within a few minutes and, by the end of the night, separated Thalia's physical body from the pine — However, she was in a dangerous physical condition, just as she had been when she'd been transformed.

Afterwards, it continues to maintain the borders at their usual strength, even without Thalia's spirit.

The Battle of the Labyrinth
In The Battle of the Labyrinth, Percy arrives at camp to find the camp has hired a new sword instructor named Quintus, who also has a pet hellhound named Mrs. O'Leary. During a new game that Quintus invented, he sends several groups of two demigods each into the camp's woods to find a gold laurel, which is tied to one of six monsters in the woods. During the game, Percy and Annabeth find an entrance to the Labyrinth under Zeus' Fist. Annabeth realizes that this passage can be used by the Titan Army to get past the camp's borders and attack from within. Annabeth leads a quest from the camp the next morning with Percy, Tyson, and Grover.

After Percy blows up Mount Saint Helens while running an errand for Hephaestus, Annabeth eventually returns to camp to break the bad news to everyone and the camp holds a funeral for Percy, who arrives during the ceremony. Percy and Annabeth return to the Labyrinth with the aid of Rachel Elizabeth Dare while Camp Half-Blood prepares for the arrival of the Titan Army. Percy and Annabeth return to camp after Daedalus refuses to help and they prepare for battle along with Nico. Monster's begin pouring out of the entrance and with the arrival of Kampe on the battlefield, the demigod forces begin to lose while several demigods were killed in the battle. The tide turns again however when Briares and Daedalus return and they crush Kampe with a pile of rocks while Grover scares the army back into the labyrinth. Daedalus then sacrifices his life to destroy the entrance to the labyrinth at Camp Half-Blood and the labyrinth itself.

The Lost Hero
It is also believed that the camp has a darker secret - Bunker 9. The bunker, which is discovered in The Lost Hero by one of the camp's new demigods, Leo Valdez, is shown by Leo to the other campers by the end of The Lost Hero. Chiron, once shown to the bunker, tells the other campers that the bunker was once used ages ago during the American Civil War when the Greek and Roman demigods fought one another. Chiron also adds that demigods used the bunker as a war base during the Demigod's Civil War, in which he states that it was just as disastrous for the demigods as it was for the mortals.

The East and the West
According to Chiron, the Greek desecration of Troy was what split demigods apart in the first place. Aeneas, the first Roman demigod, son of Venus/Aphrodite, was the last surviving prince of Troy. He fled to Italy, where the Latins (the ancestors of the Romans) lived. Aeneas was the first Roman demigod, and he was soon followed by many others. These Romans later lived in the West of North America, reputedly in the Bay Area of California. Later on, during the 1860s, the Romans, living in the Bay Area, fought with the Greeks, who were, even then, living at the camp. This was the most horrible of the wars fought between the Greeks and the Romans. A lot of wars were fought.

Unification
The following winter after the events of The Last Olympian, new demigods shows up at Camp Half-Blood. During a field trip for a juvenile detention facility, the "Wilderness School," three storm spirits attack a satyr protector, Gleeson Hedge, and three demigods. Annabeth Chase, a prominent camper at the camp, along with Butch (son of Iris) rescue these three demigods. One is revealed to be the son of Hephaestus, Leo Valdez, and another is revealed to be the daughter of Aphrodite, Piper McLean. However, it is the revelation of the third demigod's identity that shocks everyone the most: the new demigod is the full brother of Thalia Grace, Jason Grace, the son of Jupiter (Zeus' Roman form). However, he keeps calling the gods by their Roman names. He is given a quest, along with Leo and Piper to save Hera, who has been trapped by the giants. After the quest in The Lost Hero, the Roman's existence is discovered by the Greeks because of Jason, and these two camps will have to unite to fight the Giants, Gaea's most terrible children, who threaten the very roots of Western Civilization itself, Greece.

Cabins
There were originally twelve cabins (all the Olympian Gods except for Hades and Minor Gods) but after the Second Titan War, Percy made the gods promise to claim all their children and for the minor gods to have more respect, so now there are twenty cabins in total, one honoring each god or goddess. Some of the cabins include Zeus, Hera, Poseidon, Demeter,

Dionysus, Hermes, Ares, Athena, Apollo, Aphrodite, Hephaestus, and Artemis. The cabins of Hades, Iris, Hypnos, Nemesis, Nike, Hebe, Tyche, and Hecate being the latest additions. This makes in total twenty cabins.

Hera's cabin is a courtesy because she's the goddess of marriage and doesn't have demigod offspring. Artemis's cabin is also honorary because she is one of the maiden/virgin goddesses, but does sometimes play host to her Huntresses. The cabins honoring Zeus and Poseidon are supposed to be empty, but Percy Jackson and his Cyclops half brother Tyson (occasionally) occupy Poseidon's cabin, and Thalia Grace used to occupy Zeus' cabin, before she joined Artemis' Huntresses to prevent her from being the child of the prophecy, and Jason Grace now occupies the cabin until he gets back to his rightful home.

After The Last Olympian, the layout of the cabins changed dramatically, due to the deal Percy made with the gods. Now, each minor god and Hades (fortunate for Nico di Angelo) have their own cabins which means that the amount of campers will double or triple, to Mr. D.'s dismay (luckily, by this time, Zeus cut his remaining time to 50 years instead of 100). Also, now the gods are obligated to claim their demigod children by age 13. This will make for a much less crowded Hermes cabin. It is presumed that they are still making cabins. The cabins are now placed in the shape of a Greek Omega (the last letter of the Ancient Greek alphabet: Ω).

Note: Janus could be counted as one of the minor gods, and is mentioned by Percy Jackson in The Last Olympian, but please note that that would make twenty-one cabins, and that Janus is a Roman God.

Big House
The Big House, is where the Oracle of Delphi used to live in the attic, before Rachel Elizabeth Dare took the Oracle into her own body. It also is a main meeting place for the leaders of the cabins for major problems and ideas before any quests. Dionysus and Chiron enjoy playing pinochle on the front porch, the greatest game invented by man (along with Pac-Man and gladiator fighting) according to Dionysus.

Climbing Wall
The lava wall, a climbing wall, is said to pour lava out for an “extra challenge”. If the camper does not get to the top quickly the walls clash together and the camper's clothes are soaked with lava (actually torn to only threads).

Camp Borders
The camp borders are designed to keep mortals, monsters, bad weather and many other things out of the camp. Only campers, satyrs, gods, some mortals (such as May Castellan and Rachel Elizabeth Dare in The Last Olympian) and monsters who were given the permission by a camper (as Annabeth Chase did to Tyson) may enter through the border (as Grover once told Percy people let monsters in as 'practical jokes' much to Percy's shock). Once, the border was protected by many things, the most notable being a strong copper dragon. In modern times, it is passively — but effectively — defended by the magical barrier generated by Thalia's tree, created by her dad, Zeus, in her dying moments as he took pity on her.

In The Sea of Monsters, Thalia's Tree was poisoned by Luke Castellan with elder python venom from the pit of Tartarus. As the tree weakened, so did the strength of the borders. Percy managed to rescue Grover as well as steal the Fleece from Polyphemus the Cyclops. The Fleece healed Thalia's tree and restored Thalia to her original body while leaving the tree in place. The Fleece is guarded by the dragon Peleus.

During the Demigod Files, which took place about a few weeks after the Battle of the Labyrinth took place: where Percy Jackson, Annabeth Chase, Charles Beckendorf, and Silena Beauregard found the Myrmekes - ancient Greek ants the size of a terrier carrying the head of mechanical bronze dragon. The marks of the head digging on the ground revealed a massive crater with the neck of the bronze dragon. Annabeth reattached the dragon's head and led the dragon to help rescue Beckendorf, who was captured by the ants. The dragon then went berserk and Beckendorf worked with Percy to shut it down. Then it was fixed by Leo Valdez in The Lost Hero and used on the quest to rescue Hera from Porphyrion, although it was destroyed at the home of King Midas and the remaining parts were taken back to Bunker 9.

Dining Pavilion
"We still have to eat, don't we?""

- Percy, during Chiron's tour The dining pavilion is where the campers eat breakfast, lunch and dinner. The food served is a diet primary of grapes, cheese, bread, and extra lean, nymph-cut barbecue and you can ask whatever you want to drink (although Coke doesn't have the same flavor). Each cabin has their own tables and campers are not allowed to sit at a table that is not their cabin's (Annabeth Chase broke this rule to speak with Percy in The Battle of the Labyrinth only while talking about the quest.) The tables are covered with a white tablecloth fringed with purple. At the center of the pavilion is the bonfire. It is lit during the dinners. At the beginning of each meal, each cabin takes turns going up to the fire and dropping in a share of their best food as an offering for the gods (because the gods like the smell). Hestia, goddess of the hearth, gets a portion of each offering.

Stables
"Meh, the stables. You see Chiron staying in the stables?""

- Blackjack This is where they store the pegasi (and horses), like Blackjack, Percy's black pegasus. Percy can read the pegasi (and all equestrian's) minds since his father created the horses. The Demeter cabin is in charge of the pegasi riding lessons, but Aphrodite's cabin helps every now and then. Every few times, some demigod(s) would take pegasi lessons from one of the other demigods from Aphrodite's cabin. It is also shown that Chiron does not like them very much.

Armory
"Inside was not gardening tools, unless you want to make war on your tomato plants."

- Piper This is where the campers get their weapons. It is a big metal shed around the side of Athena's cabin. In The Lost Hero, Annabeth helped Piper choose her weapon, which is later a dagger named Katoptris, there. It has quite a large collection of swords, spears, clubs and even shotguns. Every camper gets a weapon, but the Hephaestus' cabin makes their own. The armory is confused as the camp forge.

Camp Forge
"It was like a steam-powered locomotive had smashed into the Greek Parthenon and they had fused together."

- Leo Valdez, talking about the forge There are white marble columns lining walls stained with soot. Chimneys on the roof pump smoke over a gable with carvings of gods and monsters. The forge is located at the edge of a stream, with waterwheels spinning bronze gears. Always, campers hear machinery working, fires crackling, and the sound of hammers against metal. Inside are tables full of projects and weapons, and there was also a big wall map of the camp, used to plan traps to catch the bronze dragon. Hephaestus' children are often, or always, working in the forges.

The Forest
The woods are where dryads live and monsters were stocked. It is known as a dangerous place, and no one should ever go there unless they were armed or with a companion. The campers play capture-the-flag in the woods every Friday, and sometimes hunt for monsters to fight as training. It is often mentioned in Percy Jackson and the Olympians.

Myrmeke Hill
The Myrmeke Hill is at first thought to be a myth, until Percy, Annabeth, Silena and Beckendorf found it. Beckendorf was captured by Myrmekes and Percy, Annabeth and Silena activated the Bronze Dragon, later named Festus, to rescue him. It is located on the North-West side of the woods. It has many nests down to the Earth's core that are stocked with larva, metal and lots of armor.

Camp Traditions
The camp has several traditions derived from its Greek roots. Winners and victors are given laurel wreaths and paraded around camp. More poignantly, anytime a camper goes on a quest, their siblings/cabin mates weave them a funeral shroud in case their sibling does not survive — if the camper has no siblings, another cabin may volunteer to do it, should they return victorious, they get to burn the shroud.

But the most prominent tradition is the camp beads. At the end of every summer session, the senior counselors vote on the biggest event of the summer and paint it on the bead:
 * The Lightning Thief - A black bead with a green trident. Percy's first year.
 * The Sea of Monsters - A bead symbolizing a little image of The Golden Fleece. Percy's second year.
 * The Titan's Curse - There was no bead. The events of this book took place in the same year as the Sea of Monsters, during the winter.
 * The Battle of the Labyrinth - An intricately designed maze to represent the Labyrinth. Percy's third year.
 * The Last Olympian - The Empire State Building with the names of the deceased in tiny Greek letters around it in a miniature border. Percy's fourth year.
 * The Lost Hero - There is no bead. The events of this book took place in the same year as The Last Olympian, only during the winter, just a few months after Percy's birthday (August 18th), at the end of the book.

There are five beads on Annabeth's necklace at the start of The Lightning Thief, from years taking place prior to the books. The ones described are Thalia's tree, a centaur in a prom dress — ("...now that was a weird summer..."), and a Greek trireme on fire. Percy interrupts Annabeth in her explanation so the last two beads are not described. Because Luke arrived the same year as Annabeth, it can be assumed he had the same set.

A game of capture the flag is played every Friday from 6:00 (PM) to 9:00 (PM). The boundary is the creek and often teams use the pile of rocks named 'Zeus' Fist'. Whenever the Hunters of Artemis come to the camp, there is a game of capture the flag and all campers participate in helping out. It is said that even the Aphrodite children go around offering to straighten peoples armor. Normally this cabin would sit on the side lines and cheer. In The Titan's Curse it is stated that the Hunters have won 56 times in a row.

Notable Campers

 * Percy Jackson - Demigod son of Poseidon, dating Annabeth Chase, Leader of Camp Half-Blood, nicknamed Seaweed brain by Annabeth, Praetor of the Twelfth Legion. (currently in Camp Jupiter)
 * Annabeth Chase - Demigod daughter of Athena, dating Percy Jackson, nicknamed Wise girl by Percy, Architect of Olympus
 * Grover Underwood - Satyr, Finder of Pan , and newest member of the Council of Cloven Elders
 * Thalia Grace - Demigod daughter of Zeus; became a Hunter of Artemis after the death of the previous leader, Zoe Nightshade during the events of The Titan's Curse during the Winter Solstice Olympian Council.
 * Rachel Elizabeth Dare - A mortal with the ability to see through the Mist. She becomes the Oracle during the events of The Last Olympian
 * Clarisse La Rue - Demigod daughter of Ares and the leader of Ares' Cabin
 * Chris Rodriguez - Demigod Son of Hermes. Clarisse's boyfriend after he had been saved by Dionysus from the Labyrinth when he went mad.
 * Nico di Angelo - Demigod son of Hades; younger brother of Bianca di Angelo.
 * Charles Beckendorf - Demigod son of Hephaestus, former leader of Cabin 9 and boyfriend of Silena Beauregard (deceased)
 * Silena Beauregard - Demigod daughter of Aphrodite and girlfriend of Charles Beckendorf. She was also good friends with Clarisse and was one of the best equestrian (deceased)
 * Jason Grace - Demigod son of Jupiter (Roman name for Zeus); Thalia's younger brother. Most of his memories were stolen by Hera, but he is recovering them gradually.
 * Piper McLean - Demigod daughter of Aphrodite. Has the ability to charmspeak. Becomes head of Aphrodite's Cabin at the end of The Lost Hero, taking the place of Drew, the previous cabin leader.
 * Leo Valdez - Demigod son of Hephaestus; he has the power of pyrokinesis (a power not seen for almost a hundred years. At the end of The Lost Hero becomes the head counselor of the Hephaestus cabin which Jake Mason happily handed over.
 * Connor Stoll - Demigod son of Hermes; brother of Travis. Co-head of the Hermes cabin with his brother after Luke's betrayal to the camp.
 * Travis Stoll - Demigod son of Hermes; brother of Connor. Co-head of Hermes cabin with his brother after Luke's betrayal to the camp.
 * Katie Gardner - Demigod daughter of Demeter.
 * Clovis - Demigod son of Hypnos. and leader of Hypnos' Cabin.
 * Butch - Demigod son of Iris. He is the camp's best equestrian and has a rainbow tattoo on his arm. Head counselor for Iris' cabin.
 * Tyson - Percy's younger brother and Cyclops son of Poseidon; friends with Annabeth, Percy (even though they're brothers), and anyone else except Percy's demigod enemies.
 * Will Solace - Demigod son of Apollo; current head counselor of the Apollo cabin. Great with healing medicine, especially when Annabeth was wounded in battle by Ethan Nakamura.
 * Lee Fletcher - Demigod son of Apollo; former head counselor of Apollo's cabin (deacesed)
 * Michael Yew - Demigod son of Apollo; former head counselor of Apollo's cabin (presumed deceased)
 * Jake Mason - Demigod son of Hephaestus; former head counselor of Hephaestus cabin; gave his position of councilor of Hephaestus cabin to Leo Valdez at the end of The Lost Hero because of his injuries.
 * Drew - Demigod daughter of Aphrodite; has the ability to charmspeak; second counselor of Aphrodite's cabin after the death of Silena Beauregard. She is forced to resign after being challenge by Piper for head of the cabin.
 * Nyssa - Demigod daughter of Hephaestus.
 * Pollux - Demigod son of Dionysus. Head counselor of Dionysus' cabin.
 * Castor - Demigod son of Dionysus (deceased)
 * Lacy - Demigod daughter of Aphrodite.
 * Mitchell - Demigod son of Aphrodite.
 * Harley - Demigod son of Hephaestus.
 * Lou Ellen- Demigod daughter of Hecate. Head Counselor of Hecate's Cabin.
 * Luke Castellan - Demigod son of Hermes. Luke was head of Hermes cabin until he deserted camp to join Kronos by the end of The Lightning Thief. He serves as a major antagonist for Percy and his friends during the Percy Jackson and the Olympians series. Hero of The First Great Prophecy. (deceased)

Camp Counselors
The camp has the tradition that the cabin member who has been there the longest becomes counselor. The only ones who can challenge this are cabin members who are older, or have completed the most quests and can challenge the current counselor.

Current Counselors

 * Cabin 1: Jason Grace
 * Cabin 2: None, as Hera has no demigod children.
 * Cabin 3: Percy Jackson
 * Cabin 4: Miranda Gardiner
 * Cabin 5: Clarisse La Rue
 * Cabin 6: Annabeth Chase
 * Cabin 7: Will Solace
 * Cabin 8: Thalia Grace
 * Cabin 9: Leo Valdez
 * Cabin 10: Piper McLean
 * Cabin 11: Connor and Travis Stoll
 * Cabin 12: Pollux
 * Cabin 13: Nico di Angelo
 * Cabin 14: Butch
 * Cabin 15: Clovis
 * Cabin 20: Lou Ellen

Staff Members

 * Dionysus - The Camp Director, who is also known as Mr. D. by the campers. He was punished by Zeus (his Dionysusgn.jpgr) to operate the camp for 100 years because tried to woo an "off limits" wood nymph. Dionysus was also forbidden to grow his own grapes. It was cut down to 50 years following the Second Olympian War.
 * Chiron - Activity Director and centaur. He is also the healer (just like a human doctor).
 * Argus - The Security guard at camp. He was created by Hera, as mentioned in The Lost Hero. He is covered with eyes from head to foot. He never speaks, as it is said he has an eye on his tongue. He is the beginning step of every quest as he is the initial driver.
 * Harpies - Three Harpies serve as "Cleaner Harpies" who would eat any camper that lingers around after noon on the last day of camp. The Harpies also cleaned the dishes with super-hot lava and are also good in mid-town traffic.
 * Tantalus - An ex-staff member of the camp and Percy's most hated person in "The Sea of Monsters." He was put in the Fields of Punishment for killing his son Pelops and serving him as food to the gods. His punishment in the Fields of Punishment was to stand under a fruit tree with low branches in the middle of a lake. When he tried to grab the fruit, the branches pulled away. When he bent down for a drink, the waters receded. He was put in Camp Half-Blood in place of Chiron (who Zeus suspected of being the culprit in the poisoning of Thalia's tree which protects the valley where Camp Half-Blood resides in). When outside of the Fields of Punishment when called to cover for Chiron, the food and drink would always avoid him so he cannot eat or drink. Tantalus was very strict and even restarted the Chariot Races. Tantalus stated that anyone who accidentally killed another camper will not get dessert for a week. His curse of not being able to touch food or drink eventually wore off, but Tantalus was still sent back to the Fields of Punishment (because it was revealed that Luke had poisoned Thalia's tree, not Chiron). No one was sad to see him go.
 * Quintus (AKA Daedalus) - Ex-staff member of the camp. Also one of the most genius men ever. He is also a demigod son of Athena who realized what Annabeth said afterwords and came to help fight the Titan army in the Battle of the Labyrinth. He sacrificed his life to deactivate the Labyrinth.
 * Peleus - A dragon that guards Thalia's tree after The Golden Fleece had freed Thalia from it.

Camp Schedule
There is no known exact schedule, but according to The Ultimate Guide, this is Percy's (which might be different for other campers) camp schedule:

Trivia

 * The road address, Farm Road 3.141, is the first four digits of pi (π).
 * Due to the magical barrier protecting the camp, precipitation and weather in the camp, (such as snow, rain, etc.) do not fall on the camp unless desired so by Mr. D. It also keeps out mortals if unneeded or for protection.
 * The cover name for camp is Delphi Strawberry Co (shown in the Last Olympian).
 * To pay their expenses, the camp grows strawberries with the help of Mr D, who has an effect on fruit bearing vines (the only reason they don't grow grapes is because he is not allowed to by the order of Zeus as punishment).
 * There is a Roman version of Camp Half-Blood called Camp Jupiter located somewhere near San Francisco, California. The entrance is inside the Caldecott Tunnel.
 * The only mortal allowed in Camp Half-Blood is Rachel Elizabeth Dare who is the camp's host for the Oracle of Delphi. However, Percy once mentioned a pizza delivery guy entered Camp Half-Blood once by just being "really lost."
 * Unlike Camp Jupiter, there are no older demigods at Camp Half-Blood. Presumably, most campers leave after reaching a certain age.
 * Jason Grace is currently a leader at Camp Half-Blood while Percy is currently a leader at Camp Half-Blood's counterpart, Camp Jupiter.
 * Camp Half Blood is always in the East because that is the Greek side and the West is the Roman side.