There are generally 2 exhibits on display at a time, each with their own admission fee. We saw the Spy exhibit (not Harry Potter, which was also showing). It was very well-done. It was informative and contained great artifacts. I went with another adult, but there were plenty of interactive stations for children if you are thinking of bringing your kids along. It is a little expensive, but what isn't in New York? Worth an hour or two of your time, especially if the weather isn't behaving (it's indoors).