Has it ever occurred to you that the stony city of Florence was literally carved out of the surrounding hills? It’s quite true. Countless local quarries provided the blocks of stone for the walls of medieval and Renaissance churches and palaces, and for the columns and architectural ornaments to decorate them. Pietraforte, a kind of light brown limestone, came from quarries at Costa San Giorgio, in the Boboli hill between Santa Felicità and Porta Romana, at Bellosguardo, and around Marignolle and Le Campore, all south of the Arno. To the north, the hills of Fiesole, Maiano and Settignano provided the blueish-grey sandstone pietra serena.