Hello, I'm local and very familiar with the park but not the gallery. I've added detail to this part of the park and corrected some errors. I don't fully understand what you mean by it being shown outside of the park but I believe the galley is now mapped correctly. if there is still an issue please fell free to reopen this note.

Please note that update can take some time to appear due to caching. you can read this wiki page on the issue which can help you clear your cache and see the changes https://wiki.openstreetmap.org/wiki/Browser_cache