Who knew grocery shopping could be so photogenic? In summer, you'll be tempted to photograph the piles of tomatoes; in winter, the tangles of greens. Wander around to get a sense of what is in season and what you will find on local menus at lunch and dinner. Rows of stalls sell meat, salami, fresh fish, pasta, cheese, and bread. If all that food makes you hungry, look for the Trattoria del Rocco inside the market, a diner that serves lunch created from produce sold on-site. The early bird gets the worm here: Everything is swept up and closed down by early afternoon.