People walk under an American flag inside the Oculus, part of the World Trade Center transportation hub.
The annual 9/11 commemorations are by now familiar rituals, centered on reading the names of the dead. But each year at ground zero, victims' relatives infuse the ceremony with personal messages of remembrance, concern and inspiration.
Associated Press/Pablo Martinez Monsivais A member of the military walks the grounds of the National 9/11 Pentagon Memorial before the start of the September 11th Pentagon Memorial Observance at the Pentagon.
Associated Press/Jae C. Hong Bianca Burton, center left, and Erin Schultheis walk around the Pepperdine University's annual display of flags honoring the victims of the 9/11 terrorist attacks.
Members of the military are seen on the grounds of the National 9/11 Pentagon Memorial before the start of the September 11th Pentagon Memorial Observance.
A member of the military walks the grounds of the National 9/11 Pentagon Memorial before the start of the September 11th Pentagon Memorial Observance at the Pentagon.
One World Trade Center appears through the open ceiling of the Oculus, part of the World Trade Center transportation hub in New York on the anniversary of 9/11 terrorist attacks. The transit hall ceiling window was opened just before 10:28 a.m., marking the moment that the North Tower of the World Trade Center collapsed on September 11, 2001.
A New York City firefighter stands at attention in front of a memorial on the side of a firehouse adjacent to One World Trade Center.
Associated Press/Pablo Martinez Monsivais Vice President Pencespeaks during the September 11th Pentagon Memorial Observance at the Pentagon.
President Trump leaves the stage after speaking at the September 11th Flight 93 Memorial Service in Shanksville, Pa.
President Donald Trump and first lady Melania Trump, escorted by Stephen Clark, Superintendent of the National Parks of Western Pennsylvania, walk along the September 11th Flight 93 memorial, Tuesday, Sept. 11, 2018, in Shanksville, Pa.
Nation & World 
