Where: Groot-Bijgaarden, Belgium
Start of construction: 14th Century
End of construction: 17th Century.
Most important renovation: 20th Century
Accessible: yes, but only in April and May of each year, when the Floralia, a world renowned
flower show takes place.
Important fact:
The castle complex consists of the castle (1640), the 30-meter high keep (1347), the outer castle (15th century) and the park (14 hectares and created in the early 20th century).
https://www.kasteelgrootbijgaarden.be/en/