At the beginning of the visit you will see this portrait of Godfrey of Buillon, whose parents were Dukes of Boulogne. Your guide will talk a lot about the Boulogne plan showed in the third picture.
The bell of the belfry was bigger than it is now. Its weight was reduced from five to four tons (if I remember well) for a decision of Napoleon's. The amount of removed bronze was used to pay the man called to make the bell smaller.
To see more photos taken inside the beffroi, visit this Travelogue.

