Serene D.
Google
Beautiful castle with 4 architectural styles lived in by 7 French Kings. Definitely go for the guided visit if you could understand French, Marion was very interesting and we enjoyed our visit with her very much. Learnt something new each time we visited with a qualified guide.
The Musée des Beaux-Arts, chapel and terraces were not included in the guided tour, so do visit on your own before or after.
You get a nice view of Blois from the terrace.
I have visited many castles in the Loire 30 years ago and it was nice to revisit a few this trip.