DSC_0153 Published July 29, 2016 at 267 × 400 in New York, New York: Lady Liberty, Ellis Island, 9/11 Memorial Museum The Tridents – two 80-foot tall steel columns that was part of the North Tower’s exterior facade (photo by David). The Tridents – two 80-foot tall steel columns that was part of the North Tower’s exterior facade (photo by David).