It's only museums I've visited myself. I actually do have a draft entry in the works about the Glass Flowers at the Harvard Natural History Museum, I should finish and publish that!

I think the site is compiled by one person. If you look at the map (https://www.niche-museums.com/map) it's heavily biased towards the southern UK and the SF Bay Area.

The Eric Carle Museum of Picture Book Art is in Amherst, MA and quite excellent.

There is or was a Museum of Bad Art (MOBA) in Boston.

https://museumofbadart.org/history/