In Russia people build these small cabins in the woods without any permits. It's not really illegal but it's not legal also but the forest service don't really mind even though they have all rights to destroy them. It's kind of a grey area when it comes to law about them. And people use fallen trees to make logs for it( can't cut wood in Russia without permission). It's not a private property and anyone can stay in them when they want or need to spend the night of they are too tired to get home. They have wood burning stoves and can be a real life saver when it's cold, you can find some dry food and firewood inside left from the previous visitor and they expect you to do the same if possible for the next guy that comes there. Nothing fancy and not all of them are in their best shape but it's much better than a tent. Not sure about other countries but it's a big NO NO in the west. Also most of them are miles deep into the woods so the local bums can't get there easily and make a mess. Just thought I'd share it.
Some video of some Russian guy doing this .
https://youtu.be/k4ZiakYLKgA?si=MAuBEVju5c4JNIZ5
Some video of some Russian guy doing this .
https://youtu.be/k4ZiakYLKgA?si=MAuBEVju5c4JNIZ5