Where: Jumilhac-le-Grand, France

Start of construction: 13th Century

End of construction: 17th Century

Accessible: yes, interior with a guide

Important fact:

During the Thirty Years' War (1618-1648), the then castle owner's wife was locked up in a room for 20 years, where, to pass the time, she applied frescoes to the walls

(see photo 2, bottom left).

http://chateaudejumilhac.com/en-gb/home/