The fire of Notre Dame today marks the end of France and probably of European civilization. Although it was just a church and therefore dedicated to religious superstition it is also the probably most important symbol of European culture after the decline of Rome.
The cathedral was built during the High Middle Ages and is probably the apex of medieval architecture. During the French Revolution it became the Temple of Reason and later the place where Napoleon was crowned Emperor effectively ending the Western Roman Empire and replacing it with modern Western society. The cathedral of Notre Dame was far more important to Europe than the World Trade Center ever was for America, since the latter one was a rather modern building.
Although the destruction of a symbol has no real effect, the Fire of Notre Dame comes to a point in history, where the French identity is completely replaced by North-African culture, the United Kingdom is ruled effectively by Saracen sharia law and has left the European Union, and Germany is collapsing under an unprecedented Saracen invasion since 2015.
Europe is broken. It has no will for survival anymore. The most powerful European nations have been lost to Saracen invaders. The national leaders are puppets of the Saracens. And the last decent Europeans feel ashamed for the degeneracy of their own homelands that makes them unworthy of being defended.
In the face of such a situation a symbolic event becomes significant. Its importance might be abstract, but historiography is something abstract. It needs key events to mark the end of an era. The Fire of Notre Dame is such a key event.
Today we have seen the end of European culture in France. And considering the importance that France had for modern Europe, it might very well be the event that future historians will take to give a date to the end of European civilization as a whole.