This file artist's rendering released in 2006 by the Lower Manhattan Development Corporation shows a ground level view of the proposed redesign of the World Trade Center memorial. After wrestling with the costs and design of the rebuilt World Trade Center site, planners of the memorial museum honoring those who died now face another unanswered question: Should visitors have to pay admission?

New York Mayor Michael Bloomberg has said he hoped that while people could visit the memorial for free, they should be charged admission to the planned musuem to help pay for the expenses of running the memorial. (AP Photo/Lower Manhattan Development Corporation, File)