This September 11 I had the opportunity to view the Tribute in Lights. The New York Municipal Art Society displays the lights only one night of the year to honor those who died when the Twin Towers fell. The lights are set up on the Battery City Park Garage and can be seen all around the city.
It is an amazing thing to see. If you ever have the opportunity to see them, take it, though that may depend on whether or not the funds necessary to run the Tribute will continue to be available.