I’m not sure that there’s an existing unifying tag for all these concepts. I’ll pile on one more: https://wiki.openstreetmap.org/wiki/Tag:historic=manor could cover a still-standing plantation house, whether or not it still functions as an estate. (One that I’ve mapped is these days considered just another home; another has a local historical museum inside.)

Hi, you might be interested in this proposed rewrite of a very frequently used template. Among other things, it replaces a gendered icon and prominent gendered parameters with a gender-neutral icon that better fits the wiki’s skin anyways.

Great, that’ll be very useful!