As a Czech citizen, I thought for a long time that allemansrätten or "Freedom to Roam" is the most natural and ordinary thing. Only when I started traveling around I began to appreciate how unique that right is.
According to https://en.wikipedia.org/wiki/Freedom_to_roam there are 11 contries in the world with this law (Scotland, Finland, Iceland, Norway, Sweden, Estonia, Latvia, Lithuania, Austria, Czech Republic and Switzerland).
Same here. I recall the story of a Texan heiress you bought a golf course in Aberdeen, North Scotland. One day she came across hikers respectfully crossing 'her land' and the golf course. Went out with a shotgun and threatened then while the hikers calmly explained their rights. Eventually she called the police and was promptly arrested herself.
Note that at least in Finland, it's not codified in law. It just has been the "way of the land" for so long that there hasn't been much need to write it down. Some of the aspects can be derived from different laws but mostly it's an unwritten, commonly understood set of principles.
There is no single "freedom-to-roam law" but many laws codify exceptions to keep freedom to roam legal. The main codification seems to be that you are allowed to infringe on others' exclusive rights to their property (outside their yard and plantations) as long as the harm is minor: wearing down surfaces by walking and cycling on them, flattening grass and meadows by (briefly) camping on them, picking berries etc.
It used to be similar in Norway as well. It was considered so self-evident that despite Norwegian law otherwise being fully codified, courts took it into account. It was codified in the 50's I think.
According to https://en.wikipedia.org/wiki/Freedom_to_roam there are 11 contries in the world with this law (Scotland, Finland, Iceland, Norway, Sweden, Estonia, Latvia, Lithuania, Austria, Czech Republic and Switzerland).