I went to the 9/11 museum yesterday...it' s pretty heavy, especially if you were here in NYC on that day, certainly if you knew someone who died (which I do not). It's really well-done, the museum itself and what they show and how they show it. I think that it is a place every visitor to NYC should see. However, it's maybe a little different for those of us who were here living through it - I almost think it isn't necessary to see it all over again - it's up to you, it's a personal thing. You'll leave a little sad, though, that's for sure.