Sept. 11, 2001 is a historic day in America and around the world.

For many, it felt like the world stood still as they watched or heard about the collapse of the Twin Towers, then the crash into the Pentagon and, finally, the crash of United Airlines Flight 93.

The day has gone down in history as one of the most tragic days in the country, claiming the lives of nearly 3,000 people and injuring more than two times as many.

During past anniversaries, the hashtag #WhereWereYou surfaced on social media as many people recounted where they learned of the attacks.

Many of the heartbreaking messages convey how people felt. Dozens showed that the attacks happened when many social media users were young and detailed how their families reacted, shaping the gravity of the news.

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8/26/17 - Atlanta, GA - Georgia leaders, including Gov. Nathan Deal, Sandra Deal, members of the King family, and Rep. Calvin Smyre,  were on hand for unveiling of the first statue of Martin Luther King Jr. on Monday at the statehouse grounds, more than three years after Gov. Nathan Deal first announced the project.  During the hour-long ceremony leading to the unveiling of the statue of Martin Luther King Jr. at the state Capitol on Monday, many speakers, including Gov. Nathan Deal, spoke of King's biography. The statue was unveiled on the anniversary of King's famed "I Have Dream" speech. BOB ANDRES  /BANDRES@AJC.COM

Credit: Bob Andres