My family and I recently visited NYC, around the end of August, and ventured to the lower end of Manhattan to have a look at the progression of the re-building of the financial district buildings after the attacks of 9-11. The thing I like about it best is the open park with the two square fountains, surrounded by the names of the 9-11 victims. The park contains this - the only tree left standing at the site in the aftermath of the attack. It was removed and nursed back to health and, according to this story, now stands at over 30 feet tall.
Here's a look at the fountains
Here's a look at how construction stands now.
The twin fountains, with square layout representing the twin towers, are just at the lower left corner of the photo above and just beyond the foreground building.
*I have my own photos at home from our visit, and plan to substitute for these later.