A nation remembers as Sept. 11 museum is dedicated in New York

The National September 11 Memorial Museum tells it in victims' last voicemails, in photos of people falling from the twin towers, in the scream of sirens, in the dust-covered shoes of those who fled the skyscrapers' collapse, in the wristwatch of one of the airline passengers who confronted the hijackers. The museum has its ceremonial dedication today deep beneath ground zero, 12½ years after the terrorist attacks on New York City and Washington, D.C.

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