The trio heads out, locating the first pearl at an old garden center but encountering Medusa, who tries to kill them until decapitated by Percy; her head is taken with them for later use. They locate the second pearl in the Parthenon in Nashville; Percy uses the winged shoes to take it from a statue of Athena. However, they are then confronted by the Hydra, which Grover petrifies using Medusa's head. The third pearl is located at the Lotus Casino in Las Vegas, where the three eat lotus flowers and forget their reason for being there. They stay in the casino for five days until Poseidon speaks in Percy's mind, helping Percy return to his senses. Percy frees Grover and Annabeth from the effects of the flowers and they flee, discovering that the casino is run by the Lotus-Eaters, and they had been keeping people captive since ancient times. With all three pearls in their possession, Percy, Grover, and Annabeth head into the Underworld, the portal to which is located in Hollywood.