Where: Krefeld, Germany

Start of construction: 12th Century

End of construction: 14th Century

Most important renovation: 20th Century

Accessible: yes

Important fact:

The castle became a ruin around 1716 due to war and a fire by lightning strike. Nothing happened for almost 350 years. After WWII, restoration finally started. The yellow forecourt building dates from 1740.

http://www.museumburglinn.de/de/