He travels to a number of places, including:
* New York City: He lives in New York City with his mom and is initially summoned to Camp Half-Blood from there.
* Camp Half-Blood: The main setting of the book, this is where he learns about his demigod status and trains to fight monsters.
* The Underworld: Percy descends to the Underworld to retrieve Zeus' lightning bolt.
* Las Vegas: He goes to Las Vegas to confront Ares.
There is no mention of Nashville in the book.