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Pictures | Wed May 21, 2014 | 7:39pm EDT

Visitors take somber tours as September 11 museum opens to public

Members of an honor guard fold the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson

Members of an honor guard fold the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas...more

Members of an honor guard fold the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson
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People designated to assist with transferring the National 9/11 Flag, donated by New York Says Thank You Foundation, hold it aloft on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson

People designated to assist with transferring the National 9/11 Flag, donated by New York Says Thank You Foundation, hold it aloft on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York...more

People designated to assist with transferring the National 9/11 Flag, donated by New York Says Thank You Foundation, hold it aloft on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson
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2 / 3
Members of an honor guard carry the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson

Members of an honor guard carry the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas...more

Members of an honor guard carry the National 9/11 Flag, donated by New York Says Thank You Foundation, on the grounds of the 9/11 Memorial Plaza before donating it to the National September 11 Memorial Museum in New York May 21, 2014. REUTERS/Lucas Jackson
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