Italian Marble Christmas Tree Ornament. "The World Trade Center Cross." Polished Botticino marble features the iconic steel beams that broke off in the shape of a cross and fell from the 67th floor of the World Trade Center Towers and landed in an upright position in the rubble. The WTC Cross was sign of hope amidst much despair is now on permanent display in the 9/11 Memorial and Museum. Image by Official Ground Zero Photographer Gary Marlon Suson.