Goode High School

This is the place where Percy attended orientation only to be attacked by monsters.

Labyrinth

This is a magical maze with many entrances created by Daedalus. It constantly changes and grows. Those who enter usually go insane or die.

Camp Half-Blood

This is where Percy goes each summer to train with other demigods. Mortals can't get in.

River Styx

This is a river in the Underworld.

Mount St. Helens

This has a volcano that contained the forge of Hephaestus where the telkhines made their weapons.

Daedalus' Workshop

This is located in the heart of the Labyrinth.

Triple G Ranch

This is where the flesh-eating horse lived.

Alcatraz

This is where Briares was held as a prisoner. It was known by mortals as a military prison.

Ogygia

This is Calypso's phantom island. It was the paradise Percy lived in while everyone thought he was dead.

Mariott Hotel