To mark the tenth anniversary of the September 11 attacks at the World Trade Center, the 9/11 Memorial, part of the National September 11 Memorial & Museum, was unveiled during a ceremony on September, 11, 2011. The memorial opened to the public the following day and, in its first three months of operation, attracted more than one million visitors. Find out about its years-long construction and planning, as well as things to see during your next visit by clicking through our gallery.
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