sentences:  This allowed the builders to construct higher walls and larger windows.From the end of the 12th century until the middle of the 13th century, the Gothic style spread from the cathedrals in Île-de-France to appear in other cities of northern France, notably Chartres Cathedral (begun 1200); Bourges Cathedral (1195 to 1230), Reims Cathedral (1211–1275), and Amiens Cathedral (begun 1250); The characteristic Gothic elements were refined to make the new cathedrals taller, wider, and more full of light.At Chartres, the use of the flying buttresses allowed the elimination of the tribune level, which allowed much higher arcades and nave, and larger windows.