This Island perhaps fits the best description of a monster's island. Annabeth and Percy both escaped her while the sorceress was attacked by Blackbeard and his pirate crew, who had been turned into guinea pigs around 300 years ago. However, Annabeth rescued him by eating one of Hermes' chewable multivitamins and attacking Circe with her bronze knife, so that she could get the sorceress to open the lid of the guinea pig cage.

She also trapped Percy when he and Annabeth were shipwrecked on her island after the abrupt sinking of the CSS Birmingham by Charybdis. Blackbeard, son of Ares, there sometime earlier.

The only improvement is that she doesn't turn men into pigs any more, but guinea pigs because they are much easier to clean. Females are in no real danger and will be treated quite well by Circe and her staff, but Circe has a strong hatred for men. The island is rather beautiful and seems like a tropical paradise with a five star resort on it. The second is the straight of Scylla and Charybdis which was used by Clarisse La Rue, daughter of Ares Percy Jackson, son of Poseidon Annabeth Chase, daughter of Athena Tyson, Cyclops son of Poseidon and the skeleton crew on the Quest for the Golden Fleece in The Sea of Monsters while on the CSS Birmingham, an old Confederate warship given to Clarisse by her father. The Mediterranean, the former location of the Sea of Monsters. Jason and the Argonauts only survived because of the protection from Hera. They roll past each other so quickly it's nearly impossible to get through them (hence the name 'Clashing Rocks'). There are the Clashing Rocks which were used by the original Jason when he was on his quest with the original Argonauts. There are only two known entrances to the Sea of Monsters, which were both used by heroes on quests.

The Sea of Monsters by Rick Riordan