The tradition of flying a flag at half-staff began when a symbolic space was left at the top of the staff for the “invisible flag of death,” signifying death’s dominion over earthly affairs.

A riderless horse accompanies the funeral procession of U.S. military officers. The horse above, Black Jack, accompanied more than 1,000 such processions, including those for John F. Kennedy, Herbert Hoover, Lyndon Johnson, and Douglas MacArthur.

When Russian ballerina Anna Pavlova died in 1931, her next show went on as scheduled, with a spotlight circling an empty stage.