- Château de Chenonceau
Every room had its own fireplace, making the castle rather cosy. This is a detail on the fireplace in Chambre de François Ier. - Château de Chambord
The vaulted ceilings in the 2nd floor: F as the initials of François Ier and plenty of salamanders, some eating the good fire and others putting out the bad fire. Just don't know which are which.