Where: Sigmaringen, Germany

Start of construction: 11th Century

End of construction: 18th Century

Most important renovation: 19th Century

Accessible: yes, interior with guide

Important fact:

Hit by a major fire in 1893, in which the eastern wing burned down. Restored (1895-1899) and redone to its present state between 1899 and 1906).

https://en.hohenzollern-schloss.de/