Where: Trazegnies, Belgium

Start of construction: 11th Century

End of construction: 17th Century

Accessible: yes, but limited and with guide

Important fact:

The striking red gatehouse is from the 16th century. The castle, which is partly ruined, contains a museum. The park, on a domain of 1 hectare, is freely accessible.

http://www.chateaudetrazegnies.be/