This museum is extremely well curated, it's an impressive yet overwhelming experience. The building is special - it may not look much from the outside but that's the point, you drop down into the basement, under the memorial fountains and see the foundations of the towers for yourself. The exhibits are harrowing yet thoughtful, and you learn a lot when you're there. I would recommend anyone visiting New York should visit this museum, it helps you understand the modern city in more depth, and you feel closer to the people of New York once you leave. Whilst fantastically done, this is a very emotional and at times disturbing experience - you often see people, myself included, becoming very upset at what they're seeing (and what some of them are re-living). There are some important points that I felt were really well done - particularly the memorial rooms, individualising each of the people lost that day - and the explanation of who those evil people were. The museum makes sure to explain what extremism is, and that those people were in no way linked to the general, peaceful Islamic faith. The large exhibits are perhaps the most harrowing, they put into perspective the sheer scale of what happened that day, and for those who never saw them, how large and impressive the twin towers once were. The steelwork, the pieces of airplane, the fire trucks and the slurry wall all show the magnitude of what happened that day. I would be mindful about whether or not I take children in there - they would probably be very upset and disturbed by some of the exhibits. There are some warning signs where you can avoid the most difficult exhibits if you wish, and there is an area dedicated to those who fell from the towers - with some sad imagery - hidden behind a wall. We used our GoCity pass to get into the museum, so didn't need to buy a ticket in advance. I highly recommend this pass for first time visitors of New York - we got in much quicker than other people.