These bookmarks are from the Eric Carle Museum of Picture Book Art, which is in Amherst, Massachusetts.
I’ve been wanting to visit since I first read about it. It opened in 2002, and it is the only full-scale museum in America devoted to picture book art. There are several galleries, with both permanent collections and rotating exhibits, as well as a library and a studio where visitors can make their own art after being inspired by what hangs on the walls. Sounds like a blissful way to spend a day.