If you love heights, then this is the place to visit! It is located within the wonderful World Trade Centre subway station, with the spectacular roof by Calatrava. You take the lift up, whilst you are shown through VR, how NY was built up over the centuries. Then, you arrive at the viewing floor and in a very theatrical way, the view is revealed! You also get an iPad so you can always find information at what you are looking at. A wonderful visit, really worth it with clear skies.
Do not go if you have a phobia of heights or lifts however, because you are very high up!