Hey, @Kirstie, for some reason, even though you sometimes tag me in these, I don't get the usual notification. I stumble upon them and am surprised to find my name. I wonder if it is happening with the others, and if it appears we are standoffish when all we are is in the dark. You might talk to the developers.
As to the question, I offer a treehouse that is basically a shed in a tree, a joke when you look at @David-and-Fiona0's and @Dieneke0's places. Wow. But I decided to answer, since the farmhouse in which we live, and in which I greet guests and serve them breakfast, is fieldstone, and unusual in this part of Southwestern Ontario, Canada, where wood is plentiful, so the also-plentiful-but-labour-intensive fieldstone goes mostly unused.
We decided on it because we liked the look, and were willing and able to do the masonry ourselves. There are pockets of surrounding Ontario, Quebec, Michigan, that feature fieldstone buildings, and that was our inspiration when it came time to do something here.
I don't put a photo of the house on the listing page, since it is not offered as a place to sleep, and it is not the draw. But it is pretty and unusual, and so gives a good impression when people arrive. It is okay to make that a surprise, I think.