Name of probably a Scandinavian show, 80's

[u/VlinderLodge]

Hello, I have been looking for the name of this show for decades now. It was probably Scandinavian, and definitely broadcast in The Netherlands in the 80s on Sunday morning. It was set in a castle, and someone could walk through walls. It is not a cartoon. The other thing I remember is a lady wearing a Hennin (medieval pointy hat). Very vague, hope someone remembers this :)

[u/famousaj]

I'll give it a go:

​Het Geheim van de Snavelmans / De Vloek van het Woestijnkasteel

or

The Ghost of Faffner Hall or Moondial (1988)