C.C.'s Spa and Resort

C.C.'s Spa and Resort is a "luxurious spa" run by the sorceress Circe, the immortal daughter of Hecate.

The Sea of Monsters
In The Sea of Monsters, Percy Jackson and Annabeth Chase wash up there after the CSS Birmingham is destroyed. Circe transforms all males who arrive at the resort into guinea pigs (Earlier Pigs, but Circe complained they were too smelly). The only known employee is Hylla, who gives Annabeth a makeover while Circe speaks with Percy alone.

After Annabeth returns Blackbeard and his pirates to human form with Hermes' multivitamins, (accidentally) they run rampant throughout the resort. It is unknown what ultimately happens to the spa after they were finished with it. Percy and Annabeth escape the spa in Blackbeard's pirate ship, the Queen Anne's Revenge.

The Son of Neptune
In The Son of Neptune, Reyna tells Percy that they had met once before, but not directly. She was on Circe's island and lived there with her sister, Hylla. She saw Percy and Annabeth arrive on the island during their quest in The Sea of Monsters and holds some anger toward him and Annabeth for destroying her home. She eventually made it to Camp Jupiter and in the four years since then, she became Praetor.