FILE - In this Dec. 20, 2011 file photo, visitors to the National September 11 Memorial in New York walk around its twin pools. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Mark Lennihan, File)

Associated Press
FILE - In this Dec. 20, 2011 file photo, visitors to the National September 11 Memorial in New York walk around its twin pools. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Mark Lennihan, File)
FILE - In this Dec. 20, 2011 file photo, visitors to the National September 11 Memorial in New York walk around its twin pools. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Mark Lennihan, File)
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