Mercato Centrale Roma
This gourmet food hall is in the last place you'd expect—Termini Station—and it's great for a quick bite even if you're not catching a train. There are stalls from some of Rome's best food purveyors, including Stefano Callegari (of trapizzino fame), pizzaiolo Marco Quintili, and fritti by Arcangelo Dandini. In addition to pizza, pasta, and gelato, you'll also find sushi, empanadas, hamburgers, truffle dishes, and Sicilian specialties.