A 'punch in the gut'

...or 'gut-wrenching' I will never in my entire life, (barring Alzheimer's or dementia) - forget the feeling of being at Ground Zero in NYC, March of 2012.  It was, what I imagined visiting a concentration camp, or any other place where many people died in a tragic/horrifying way...

Here the NY Times discusses the museum and provides haunting photos.  I've no real reason to want to go to the museum, but I feel the coming generations of school children should make the trip - the same way they visit Gettysburg, or other places of historical portent.