I found myself in Baltimore not too long ago. I wouldn't recommend it. I went to the National Museum Dentistry. Really.
It wasn't too bad actually, and you don't have to fight your way through the crowds of schoolchildren like you do at the Smithsonian. I did like this postcard of the monkey dentist and the hippopatamus. Mounting with clear corner tabs like this behind a nice matte is a good way to go if you don't want to use any adhesives.
I don't think I've seen any other cards from this (French?) series. If you happen to know more about this artist or series please let me know.