Lightning Thief: In this cover, we see our main three characters, Percy, Annabeth, and Grover as they travel the US. They fight monsters and along the way visit the St. Louis Arch, the Parthenon in Tennessee, and the Empire State Building, home of the gods.
Sea of Monsters: On this cover, we see Percy, Annabeth, and Tyson, a new character, as they traverse the Atlantic Ocean. Behind them is the C.S.S. Birmingham, another demigod boat that they later board, as well as the sea monsters Charybdis and Scylla.
Titan's Curse: In this book, Percy, seen at the top of the cover riding a pegasus, joins the quest of Artemis's hunters and his friend Grover as they go to California to rescue their friend Annabeth. The Washington Monument and Golden Gate Bridge represent two of their main stops along their journey: D.C. and San Francisco.
