Notre Dame de Paris is widely considered one of the finest examples of French Gothic architecture in France and in Europe, and the naturalism of its sculptures and stained glass are in contrast with earlier Romanesque architecture. The first period of construction from 1163 into the 1240's coincided with the musical experiments of the Notre Dame school.
Notre Dame de Paris was among the first buildings in the world to use the flying buttress (arched exterior supports). The building was not originally designed to include the flying buttresses around the choir and nave. After the construction began and the thinner walls (popularized in the Gothic style) grew ever higher, stress fractures began to occur as the walls pushed outward. In response, the cathedral's architects built supports around the outside walls, and later additions continued the pattern. The cathedral was essentially complete by 1345.
The cathedral suffered desecration during the radical phase of the French Revolution in the 1790s, when much of its religious imagery was damaged or destroyed. An extensive restoration supervised by Eugène Viollet-le-Duc removed remaining decoration, returning the cathedral to an 'original' gothic state.
Jean de Jandun recognized the cathedral as one of Paris's three most important buildings in his 1323 "Treatise on the Praises of Paris":
