Anonymous wrote:Seconded for Sainte Chapelle. If you hit it on a sunny day, it’s breath-takingly beautiful. It’s nighttime events can also be extraordinary. Really my favorite place. Buy tix on the app and avoid the long line.
Agreed, Sainte Chapelle was shockingly beautiful, beyond what I expected. When I was there it was mid-September and there was no line.
In the same area, if you are a history buff, the archaeological museum of ancient Paris that's across from Notre Dame was really interesting. Like London, it has Roman roots and a ton of (literally) buried history.