Reims Cathedral is the most amazing place. Many French kings were crowned here and the building reflects this!
Have a look at Wikipedia;
I was very lucky to be able to take my grand-daughter Tegan on a trip to Europe over her recent half term.
We spent a few days in Germany, staying in the beautiful old village of Neumagen-Dhrone on the Mosel Valley, then a couple of days in Reims and a final few days in Paris. We had an excellent time :-)