The Stained Glass of Notre-Dame

Commisioned during the reign of Louis VII, construction of the cathedral, its chapels, graves and the famous stained glass windows took place between 1163 and 1250.

There's a lot more information available through this link.

Photos below are of the cathedral from the outside, of the carvings above the entrance, of one of the windows in the north wall, of the lit hall during a service, and a sculpture of Charlemagne in its courtyard.