I put this here, rather than in Religion & Philosophy, because the object in question is a coincidentally cross-shaped steel I-beam support post junction that resulted from the building collapse. There are rivet finger joints cut into the lateral beam at equal points along it's width, so it broke up into the shape of a nearly perfect Christian cross, with similar proportions between vertical and horizontal members. The aftermath of 9/11 at World Trade was very gruesome, dangerous and depressing for the rescue and retrieval workers. Those who felt so inclined, took comfort in standing and quietly praying or meditating for the victims in front of it while on work breaks. That is a well-documented historical incident.
As an atheist, I am angered by the law suit brought by American Atheists (who the fuck are they, anyway? A special project committee to stir up the fundie voters?) to ban the cross artifact from being displayed in the 9/11 museum. If there were other religious artifacts found at the disaster site, they would be displayed at the museum, too. The lawsuit is petty, and misses the point that the object is historically and archeologically in context with the site, and documents the history of 9/11 at World Trade. It is not duplicitous proselytizing , such as a purchased, man-made engraved Ten Commandments or cross being installed in a government building or courthouse entry.
http://www.today.com/news/world-trade-center-cross-fight-continues-athiest-group-appeals-ruling-2D79328902Picture below of the object as it was being crated for storage at one of the warehouses where all other large evidence pieces were gathered for forensic analysis.
Picture below of the object earlier in the recovery work, as it was found, with a torn bit of sheet steel cladding still attached to it.