Spire hoisted to World Trade Center roof ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page LUCAS JACKSON/Reuters Workers attached an American flag on the final piece of the World Trade Center's spire. STAN HONDA/AFP They watched as the final section was raised to a temporary work platform atop the structure. LUCAS JACKSON/Reuters People on the street also watched as the section was lifted. Mark Lennihan/AP The piece will be added to the spire at a later date, capping off the tower at 1,776 feet. Spencer Platt/Getty Images The 408-foot spire can be seen from the Brooklyn Promenade after it was hoisted to the top.