"We remember, we rebuild" President vows

Space Shuttle Enterprise Lands at New York City's Intrepid Museum
Space shuttle Enterprise sails up NYC's Hudson Rover with the World Trade Center's Freedom Tower in the background while traveling to the Intrepid Sea, Air and Space Museum on June 6, 2012. (Intrepid Sea, Air & Space Museum)

President Barack Obama and first lady Michelle Obama on Thursday, June 14, toured the soaring skyscraper being built to replace the twin towers destroyed on September 11, 2001, in a poignant visit to mark a new chapter of recovery from the traumatic attack.