Where: Jumilhac-le-Grand, France
Start of construction: 13th Century
End of construction: 17th Century
Accessible: yes, interior with a guide
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).