Montefalco, Umbria is home to sagrantino, a grape that makes a majestic dry red with strong tannins and rich fruit. Lovely, too, is its sweet expression, the dessert wine passito. Sagrantino also forms the backbone of a blend, montefalco rosso. White wines include fresh, light grechetto and elegant trebbiano spoletino. Here, 13 of our favorite bottles.