Chartres Cathedral, also known as the Cathedral of Our Lady of Chartres, is a Roman Catholic church in Chartres, France, about 80 km southwest of Paris, and is the seat of the Bishop of Chartres. Mostly constructed between 1194 and 1220, it stands at the site of at least five cathedrals that have occupied the site since the Diocese of Chartres was formed as an episcopal see in the 4th century. It is in the High Gothic and Romanesque styles.
The cathedral is designated a World Heritage Site by UNESCO, which calls it "the high point of French Gothic art" and a "masterpiece".
The cathedral is well-preserved and well-restored: the majority of the original stained glass windows survive intact, while the architecture has seen only minor changes since the early 13th century. The building's exterior is dominated by heavy flying buttresses which allowed the architects to increase the window size significantly, while the west end is dominated by two contrasting spires – a 105-metre plain pyramid completed around 1160 and a 113-metre early 16th-century Flamboyant spire on top of an older tower.