It's a federal holiday and day of service to mark the birthday of the iconic civil rights leader.
Dr. King's life and legacy was honored in Philadelphia with the annual National Bell Ringing ceremony.
The tradition went on, however, it was held at Hotel 21 at 17th and Market streets because the real Liberty Bell is closed due to the government shutdown.
A substitute bell was used courtesy of the Philadelphia Fire Department.
Mayor Jim Kenney and other dignitaries were on hand for the event.
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