Watch the 9/11 Museum dedication ceremony on 7online

NEW YORK (WABC) -- Dignitaries, first responders and victims' families gathered at ground zero Thursday for the ceremonial dedication of the 9/11 Museum and Memorial.

Part 1:

9/11 Museum Dedication: Part 1

Part 2:

9/11 Museum Dedication: Part 2

Part 3:

9/11 Museum dedication: Part 3

Part 4:

9/11 Museum: Part 4

Part 5:

9/11 Memorial: Part 5