20th anniversary of the September 11, 2001 attacks
U.S. Vice President Kamala Harris walks to the boulder which marks the general location of the impact site where the hijacked United Airlines Flight 93 plane crashed during an event commemorating the 20th anniversary of the September 11, 2001 attacks, in Stoystown, Pennsylvania, U.S., September 11, 2021. REUTERS/Hannah Beier