Episode 102

"Ruins and Lost Ones! Vivi, Comrades, and the Shape of a Country" is the 102nd episode of One Piece.

Short Summary
Zoro, Chopper and Luffy manage to get themselves lost, because of Luffy, and stumble across some huge underground ruins which has Poneglyph.

Trivia

 * This is the first time Poneglyphs are shown in One Piece, but is considered non-cannon as this was a filler episode.
 * Luffy sees a mirage of Crocodile and refers to it as him, despite the fact he's never seen Crocodile before this point.