National Archives of Belgium

From the longer Wikipedia page

The National Archives of Belgium (French: Archives générales du Royaume, Dutch: Algemeen Rijksarchief, literally the "General Archives of the Kingdom"; German: Generalstaatsarchiv) is the main depository of the Belgian State Archives. It is located on rue de Ruysbroeck/Ruysbroeckstraat, next to the Mont des Arts, in central Brussels. This archive repository holds over 70 kilometres (43 mi) of archives.

The website is.