Notre-Dame Is Burning

As the actual Notre-Dame de Paris cathedral was under reconstruction, none of the scenes could be shot there. So other cathedrals had to fill in the main role. First, the Bourges Cathedral was used for many scenes outside the cathedral. Then, the Notre-Dame d'Amiens Cathedral, whose spire and certain parts of the building are similar to those of Notre-Dame. Finally, the Saint-Étienne cathedral in Sens, where the forecourt, the tower stairs and the nave were used, as well as the scenes where the 13th century wooden framework is catching fire.

At 1h20m42s the "live stream" of the Collossus appears clearly to be a video running on MPC due to the Option Menu showing after a right click on the footage.