Stunning images of the New York City skyline every year on 9/11

New York City commemorates the attacks each year by casting 88 searchlights into the sky, creating two columns of light to represent the Twin Towers. The installation, known as Tribute in Light, started on the first anniversary of 9/11 and has since become an annual memorial.

Since 2011, politicians have not been allowed to read names or deliver remarks at the 9/11 commemoration service in order to preserve the apolitical nature of the ceremony.

As New Yorkers gathered for another year of memorial services, former President Obama delivered a speech at the Pentagon in Washington, DC. "Beginning tomorrow, there will be teenagers — young adults — who were born after 9/11," Obama said. "While these young Americans did not know the horrors of that day, their lives have been shaped by all the days since."

President Donald Trump delivered remarks at the Pentagon's 9/11 memorial service last year. "We're gathered here today to remember a morning that started very much like this one," he said. "On that day, not only did the world change, but we all changed. Our eyes were opened to the depths of the evil we face. But in that hour of darkness, we also came together with renewed purpose. Our differences never looked so small, our common bonds never felt so strong."