FILE - This undated file photo provided by the National Trust for Historic Preservation shows the World Trade Center Vesey Street staircase in New York. The National Trust for Historic Preservation has released its annual list of America's 11 Most Endangered Historic Places, which once included the staircase, which is now listed as "saved." Before the 2001 terrorist attacks, the stairs consisted of two granite-clad flights of stairs and an escalator that led from the trade center plaza to Vesey Street. When the towers collapsed, the heavily damaged stairs served as an escape route for hundreds of people. In 2008, the staircase was installed at the below-ground memorial museum being constructed at ground zero. (AP Photo/Robert Kornfeld, Jr. and Richard Zimbler, National Trust, File)

Associated Press
FILE - This undated file photo provided by the National Trust for Historic Preservation shows the World Trade Center Vesey Street staircase in New York. The National Trust for Historic Preservation has released its annual list of America's 11 Most Endangered Historic Places, which once included the staircase, which is now listed as "saved." Before the 2001 terrorist attacks, the stairs consisted of two granite-clad flights of stairs and an escalator that led from the trade center plaza to Vesey Street. When the towers collapsed, the heavily damaged stairs served as an escape route for hundreds of people.  In 2008, the staircase was installed at the below-ground memorial museum being constructed at ground zero. (AP Photo/Robert Kornfeld, Jr. and Richard Zimbler, National Trust, File)
FILE - This undated file photo provided by the National Trust for Historic Preservation shows the World Trade Center Vesey Street staircase in New York. The National Trust for Historic Preservation has released its annual list of America's 11 Most Endangered Historic Places, which once included the staircase, which is now listed as "saved." Before the 2001 terrorist attacks, the stairs consisted of two granite-clad flights of stairs and an escalator that led from the trade center plaza to Vesey Street. When the towers collapsed, the heavily damaged stairs served as an escape route for hundreds of people. In 2008, the staircase was installed at the below-ground memorial museum being constructed at ground zero. (AP Photo/Robert Kornfeld, Jr. and Richard Zimbler, National Trust, File)
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