Prosecco comes from the hills north of Venice and exists in two tiers. Prosecco DOC is the broad denomination, covering a large zone across nine provinces in the Veneto and Friuli Venezia Giulia, established in 2009 to protect the name after the grape once called Prosecco was renamed Glera. Prosecco Superiore DOCG comes only from Conegliano Valdobbiadene, a smaller hillside zone about 50 kilometers north of Venice, where steep, hand-tended vineyards produce more concentrated grapes; the hills became a UNESCO World Heritage Site in 2019. Within Valdobbiadene, Cartizze is the most prized subzone, a single hillside of roughly 107 hectares that yields the richest, most structured wines and the highest prices. Both DOC and DOCG are made from Glera using the Charmat method, a tank-based second fermentation that preserves the wine's fresh, fruity character. In Venice, prosecco is drunk as an ombra, a small glass of wine, a tradition said to date back to market vendors who moved their wine carts to follow the shadow of the Campanile di San Marco to keep the bottles cool. Bacari across San Polo and Cannaregio pour prosecco sfuso, unlabeled house prosecco drawn from a tap or demijohn, alongside bottled DOC and DOCG options. A glass of sfuso costs 1.50 to 3 EUR, bottled DOC runs 3 to 5 EUR a glass, Valdobbiadene DOCG 5 to 8 EUR, and Cartizze 8 to 12 EUR a glass or 25 to 40 EUR a bottle.