First of all the name of the building, Bouchefort, soundend interesting. Bouche means mouth in french. When you translate the whole name of the building in english it means Mouthfort.
The floor plan stood out because of its octagonal form and the variety of the rooms.
Lastly i was very impressed by the sectional drawing. It shows the beautiful dome with its figurative columns. As highlight you can see the swirling staircase which leads you to the top.
It is a beautiful building/drawing.