Claudia takes Gwyneth for a nighttime drive through her hometown of Barcelona. Gwyneth does a celebrity appearance and then the two ladies sneak off to the gourmet department to stock up on snacks for the next leg of their journey. The next morning, Mario and Gwyneth dive into Spanish bubbly in the cellars at Segura Viudas. Meanwhile, Mark and Claudia take to the seas to enjoy some of the most sought-after shellfish in the Mediterranean and later to a fish auction that has all the excitement of a Major League game. Back in wine country, Mario and Gwyneth grill a Catalan feast. Later, Mario shocks Gwyneth when they pick up an unlikely hitchhiker. That night in Barcelona, Mario and Gwyneth join friends for a rock star dinner at the #ber-trendy restaurant Inopia.