It was a mid-19th century addition.

In 1844, after having undergone structural and aesthetic damage during earlier Parisian political revolutions, the Notre Dame Cathedral was renovated under the direction of architect Viollet-le-Duc. The work done on the exterior of the cathedral, such as the addition of the new spire shown here, consisted mainly of the restoration of sculptures, gargoyles and the general façade of the monument. This photograph was taken in 1865 by Charles Marville, who became well-known for capturing images of the older Parisian quarters prior to urbanization.

https://commons.wikimedia.org/wiki/File:The_new_spire_of_Notre_Dame_de_Paris,_1865.jpg

I can't begin to comprehend this loss. I don't think its possible.

was constructed in the 13th century, probably between 1220 and 1230. It was battered, weakened and bent by the wind over five centuries, and finally was removed in 1786.

... but the priceless artworks, if they cannot be rescued in time, are gone forever. Also the historic stained glass windows would be remade, but not in the same style & technique as before. They will be modern replacements, not the same.

This is an important piece of French history - European history - that's going up in smoke.

I am in tears over this. I am glad I got to see it in person, but there is nothing that can replace this beautiful cathedral. What happened here?