They hold (held?) small, intimate classical concerts in the chapel infrequently during the summer which gave the audience a glimpse of what it must've been like to live like royalty. The experience was sublime.
La Sainte-Chapelle was far better than the Notre Dame for me. I went to mass at the cathedral but the art and design of the Saint-Chapelle was more beautiful to me. I grew up catholic so maybe huge grand cathedrals don't really inspire much beyond reluctance and memories of suffocating in stuffy cathedrals my whole childhhood.
It is a beautiful piece of history, but that's the extent of it for me. Cheers to those to find the cathedral moving or breathtaking.