This Jan. 15, 2013 photo shows graffiti left by visitors to the World Trade Center on a steel column on the 104th floor of One World Trade Center in New York. Construction workers finis

 

              This Jan. 15, 2013 photo shows graffiti left by visitors to the World Trade Center on a steel column on the 104th floor of One World Trade Center in New York. Construction workers finis
This Jan. 15, 2013 photo shows graffiti left by visitors to the World Trade Center on a steel column on the 104th 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)