On the other hand, in the US you can buy a piece of forest, build your own private cabin in it if you want and put a fence around your property to keep everyone else out. In the country I currently live in (Germany), you cannot.
Is it really true that nobody in Germany is allowed to fence their property?
Oh, and you're not allowed to build any cabins either, even if you own that piece of forest.
However, I'm not certain that that's the case everywhere in Germany or only in some states.
There is property where you can build a proper house and live there (requirement is, that there is infrastructure, like water and electricity). Then there are gardens, where maybe a small cabin is allowed (but you may not officially live there). And then there is everything else, where you normally cannot build anything.