We were walking along the street one day and saw a poster advertising a concert at Sainte Chapelle, so we decided to check it out. What an experience! I still get chills when I think of the beautiful chamber music being played by a string quartet as the sun was starting to set, shining through gorgeous stained-glass windows.
The Chapel is surrounded by the most incredible stained-glass windows I think I have ever seen. It is a small chapel and a stunning experience just to sit and view the windows.
I highly recommend this site. If you can catch a concert there, by all means do it!