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WASHINGTON, DC - JANUARY 20:  Spectators fill the National Mall in front of the U.S. Capitol on January 20, 2017 in Washington, DC. In today's inauguration ceremony Donald J. Trump becomes the 45th president of the United States.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - JANUARY 20:  Spectators fill the National Mall in front of the U.S. Capitol on January 20, 2017 in Washington, DC. In today's inauguration ceremony Donald J. Trump becomes the 45th president of the United States.  (Photo by Alex Wong/Getty Images)

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    Inauguration crowds in fast forward

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Inauguration crowds in fast forward

Time-lapse video of the crowds filling up and then emptying out of the National Mall during President Trump's inauguration day.

Inauguration crowds in fast forward

Time-lapse video of the crowds filling up and then emptying out of the National Mall during President Trump's inauguration day.