WTC - Ground Zero, New York City
Don't bother going there now - there is absolutely nothing to see, there are wooden boards around the area and you will surely be dissapointed.
Unique Suggestions: bring a book :) The area around there is a business area, there aren't many places to go out for a decent meal or hang out or other things to see, unless you are interested in taking a tour of the stock exchange or something. BUT if you are there check out the pakistani tea kitchen. mmmmm good simple cheap indian food.
Fun Alternatives: Walk across the Brooklyn Bridge!! Great view of manhattan skyline and it brings you to Brooklyn which is da bomb!