Top ten according to some guy: https://frogandprincess.wordpress.com/tag/chateau-dazay-le-rideau/
And here is the place where one can see miniature copies of all the castles - to figure out which ones to travel to:
Здесь "люди, как всегда, кучкуются в нескольких местах, а остальные - довольно пустынны. Вот в Council Hall пришлось как следует изощряться. Впрочем, главное - не вляпаться в экскурсию."
Blois was the seat of powerful counts since the IX century and a royal residence in the XV-XVI centuries. In addition to the castle, the town has several medieval quarters, each with distinct character.
View from the Francois I wing staircase
Chambord was built as a hunting lodge for Francis I but never fully completed. Compared to many other Loire Valley castles, it has much less history and seems imposing but rather empty. The roof terraces, however, with their elaborate towers and chimneys, are spectacular.
View from Grand Canal