After the Sainte-Chapelle we walked across the island in the Seine to see the cathedral of Notre Dame Paris. Started in 1163, it wasn't completed for 170 years... That's a lot of work!
They still hold Mass here multiple times each day. A choir was singing plainsong while we toured the building.
Photos from the visit...
North Transept Rose Window
Wooden Model of Notre Dame showing Flying Buttresses surrounding Apse
Gothic Architecture Details
Family from Back of Notre Dame on Bridge over Seine
Back of Notre Dame showing Flying Buttresses
The happy family being in Paris at Notre Dame
Full Side View from River Seine
Then on to the Batobus - a river tour of the Seine taking us from Notre Dame through the city down to the Eiffel Tower.