We have just begun a renovation of the boys bathroom in our 109 year old house. It’s not clear to me when all of the previous renovations were done, but as the demolition proceeds you can see the layers of renovation.
Here you can see the framing of an old door with newer wood to close it off. The other side of the door now would go into my closet. You can also see the fuse box for the old knob and tube wiring (not still used thank goodness).
And here is the bath and toilet/vanity areas:
I’ll post more pics as the renovation continues.