If you are ever in San Francisco, make sure to pay a visit to the Cartoon Art Museum! I stumbled upon a sign for one of their special events in the street, and I was surprised since I had never heard of it.
They have over 6,000 original art pieces, and a whole section devoted to animation with many storyboards, original hand painted cells and backgrounds. They had wonderful cells from Disney’s Sleeping Beauty, Snow White, Alladin, and many Hannah Barbera cells as well and even some archival prints of Gertie the Dinosaur.
They are located on 655 Mission street, one block away from the Metreon, in between Montgomery and 3rd street. It is not easy to find, but you have to look out for their yellow banner. It is a traditional gallery space, set behind their bookstore in the front. They also lead cartoon camps for kids.