Which architectural feature is a hallmark of Gothic architecture?

The architectural feature that distinguishes Gothic architecture is the use of pointed arches. This innovation allowed for a more vertical and soaring structure compared to the rounded arches common in Romanesque architecture. Pointed arches help to distribute weight more effectively, enabling the construction of taller buildings with larger windows. This not only enhanced the structural integrity of cathedrals and other Gothic buildings but also allowed for the inclusion of stained glass windows, which became a prominent feature of Gothic design.

In contrast, the other options relate to architectural styles that preceded or differed from Gothic architecture. Round arches, which were popular during the Romanesque period, focus more on a horizontal aesthetic. Simplistic columns and flat roofs do not capture the elaborate design and verticality that characterize the Gothic style. Thus, the pointed arch emerges as a defining element that contributes to the overall aesthetic and structural advancements of Gothic architecture.