I guess it depends on what it is. A friend of mine’s family owns some land where Tanum carvings are: https://en.m.wikipedia.org/wiki/Rock_Carvings_in_Tanum.

The government probably knows the carvings are there but doesn’t really force his family to take any steps to protect the rocks as far as I’m aware. They are just chilling in the forest covered in moss and dead leaves all the time.

I suspect they would have something to say if his family tried to develop the land though.