That is the ongoing new construction at Ground Zero in New York.
Those "backpackers" that you see in the foreground are a GoRuck team working their way through their Challenge.
I'll be doing a Challenge with my son in Austin, TX on May 4th, 2013.
Thanks for the input on the thread and the question about the avatar.
Chris does excellent work and I am sure you will be happy with the pack that he has built for you.