A long time ago, long enough that I've forgotten where I wrote about it, when I first started going out and exploring the outside world as Susie back around 2016/17, one of my walks led me down a side path off the canal towards one of the neighbouring villages. Almost the first thing I noticed when not keeping a wary eye for other people on the path was that a number of the trees along the path were adorned with tiny wooden doors and houses. There was even a sign hanging in one showing "This Way to Fairyland ->".
(I've grown a lot more confident about meeting other people when I'm out and now it's something I look forward to, otherwise walks can feel a bit lonely. This morning I lost count after exchanging about a dozen 'good mornings' and stopping to fuss several friendly dogs. I wonder if it's the walks I now I look forward to more, or the small social interactions as Susie, as a sort of validation/reassurance that I'm not seen as the terrible ogre the Tory right wing would like you to believe.)
The Fairyland sign is no longer there as far as I could tell when, on a whim, I decided to explore that path again this morning. But the little fairy doors and houses are still in the trees. In fact there seem to be more than I remember. Some of the additions, like the little wooden boat floating in the creek, were even more surreal.
Wiki has an entry for Fairy Door, and it seems to be something that started around 2015/2015 both in the US and in part of the UK (though it also warns of the harm that can be done nailing or gluing things on trees). But it's an odd little form of rural art, or whimsy, a bit like the trend for decorating street furniture in towns (knitted hats on post-boxes, or scarves for lampposts). It's also rather charming.