Inside the National Constitution Center in Philadelphia, you'll first see a picture of Dr. Martin Luther King Jr. before walking into the First Amendment Gallery. "He's really one of our ...

The two events don't usually coincide, but inauguration day is always held on Jan. 20, as specified by the Constitution's 20th Amendment. Meanwhile, Martin Luther King Jr. Day is observed on the ...

FILE - In this Aug. 28, 1963, file photo Dr. Martin Luther King Jr., center left with arms raised, marches along Constitution Avenue with other civil rights protestors carrying placards ...