Those places are not, for example, shopping malls.

Pretty sure they have shops there, as well. However, the people stocking the shops probably put on some clothes when they need to venture outside to get supplies.

Well I have never witnessed a mythical naked shopping mall, just some outdoor parks and gardens out away from most other people where only the clued-in would go. It is not ok to go out naked in public!

The ones I mean are more like camp sites. But I haven't been there myself. Isn't "nudist camp" also a thing in the US?

My reference for nudism is various parts of the Isar and Englisch Garten in Munich. In the US, nudist sites aren't really a thing, certainly not in any major city.

I know the Englische Garten. You can't go shopping in the nude there. I was talking about nudist camps. Afaik in the former socialist east Germany, nudist culture was actually a kind of rebellion against the government.