A Castle Full of Questions

I've been to the museums of the Castello Sforzesco before when I found them full of interesting items and actually managed to find the musical instrument room.  This time though, I didn't find the musical instrument room but found it full of questions instead.  Here are just a few that came to mind on a recent, welcomly air conditioned, walk around the museums...

How do you get a building, complete with alfrescos, into a building?

How did this 1470 mural get 'discovered' in 1911?  Were all the porticos also originally covered in murals too?

How much does this Curate get paid for sitting in this chair, on his phone, and dozing?

What originally happened in a room that is 97 steps long (on my stride)?

Why do bees coming out of a baby's mouth get classed as a 'miracle'?