So, according to the Hungarian online news, the worlds third judo museum (after Japan and France) was opened in the capital of Hungary, Budapest. (Link to the article, in case you speak Hungarian:

The website of the museum:

So, when you'll visit Budapest the next time, stop by to see some olympic and world champion medals, documents from the history of the art and sport and such... I plan to check it out myself and post a review here but if you beat me to it, feel free to write up.