There is a park in my neighborhood, half of which is designated as a nature play space. Where all those things are allowed, lots of forts. It appears it was as

There is a park in my neighborhood, half of which is designated as a nature play space. Where all those things are allowed, lots of forts. It appears it was associated with the national wildlife federation natural learning initiative. https://www.nwf.org/Kids-and-Family/Connecting-Kids-and-Nature/Nature-Play-Spaces https://www.nwf.org/Kids-and-Family/Connecting-Kids-and-Natu... Not sure if there is a list of such places though