Chambord stairs

This is a view of the famous stairs of the Chambord castle (with 2 "propellers", that is to say that you can go up and down from 2 sides on a same floor without being in the same propellers)

One other famous thing of Chambord is the number of chimney : 426...

I let you make some research about this famous castle, here for example :

http://fr.wikipedia.org/wiki/Ch%C3%A2teau_de_Chambord (french)

or here

http://en.wikipedia.org/wiki/Ch%C3%A2teau_de_Chambord (english)