Construction of the cathedral was begun in 1163 by Bishop Maurice de Sully and was completed in 1345. Over the centuries, little maintenance had been done so in the 19th century Violet-le-Duc saw to its restoration.
Notre-Dame Cathedral combines balanced proportions and harmonious lines with subdued decoration. The facade and transept portals are lavishly sculpted. The transept is lit by two magnificent rose windows. From the South Tower observation platform, there is a splendid view of the spire and flying buttresses.