In this Jan. 15, 2013 photo, autographs cover a wall on a top floor of One World Trade Center in New York. Construction workers finishing New York's tallest building at the World Trade Center are leaving their personal marks on the concrete and steel in the form of graffiti. (AP Photo/Mark Lennihan)

Associated Press
In this Jan. 15, 2013 photo, autographs cover a wall on a top floor of One World Trade Center in New York. Construction workers finishing New York's tallest building at the World Trade Center are leaving their personal marks on the concrete and steel in the form of graffiti. (AP Photo/Mark Lennihan)
In this Jan. 15, 2013 photo, autographs cover a wall on a top floor of One World Trade Center in New York. Construction workers finishing New York's tallest building at the World Trade Center are leaving their personal marks on the concrete and steel in the form of graffiti. (AP Photo/Mark Lennihan)
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