I just discovered that @palaisdetokyo joined the fediverse at the end of last year with little fan fare. I see they still haven't added a social link to the bottom of their website either but they did verify their URL here which is more then many institutions.

I added their account to @wikidata so maybe they will now automatically show up now on various #fediverse account viewing websites that source from there.
https://wikidata.org/wiki/Q25395733