Conservatory. This is a "wishlist" type of thing. The sideyard would be nice for this, but I think I'd prefer an outdoor space. Also, I wonder how much these heat up ... would likely need some cooling installed if this was in our backyard, given that we have full sun for most of the day.
~ Can you just imagine the fae playing hide-and-seek among the plants and treasures in this lovely room? ~ :)