What notable architectural innovation is associated with Gothic structures?

The utilization of flying buttresses is a key architectural innovation associated with Gothic structures. Flying buttresses are external supports that allow for the construction of higher walls and larger windows, which became a hallmark of the Gothic style. This design feature enabled architects to distribute the weight of the roof and walls more effectively, allowing for the incorporation of stained glass windows that filled cathedrals with light and intricate designs.

Unlike previous architectural styles that relied heavily on thick, solid walls, Gothic architecture embraced verticality and light, making use of these innovative supports. This not only advanced the aesthetic aspects of building design but also reflected a shift in structural engineering during the medieval period. The flying buttress became an integral part of many famous Gothic cathedrals, such as Notre-Dame in Paris and Chartres Cathedral, exemplifying the style's emphasis on height and luminosity.