This was the Tribute in Light memorial near the World Trade Center ground zero site in lower Manhattan.
The twin beams of light illuminated the evening sky for a month from 3/11/02 to 4/13/02.
Daniel Mowry of DSM, Iowa wrote on 11/20/02: Wow. Thank you so much for your artistic and technical work. I really enjoyed viewing the images online. I live in Des Moines and this was the "closest" I felt to New York City since the 11th.