In Stockholm where I live in Sweden we have a couple of old observatories. One of them is Boberg's Observatory at Skansen. I have taken some photos of it and written down some information. As it's today it isn't open for the public, maybe in the future.
https://www.astrofriend.eu/astronomy...y-skansen.html
Ferdinand Boberg was a famous architect in Sweden and this observatory was a gift to Skansen from him.
Lars