This anniversary reminds us that thousands of days can go by in the blink of an eye.

Ten years ago, we watched in shock and horror as nearly 3,000 people were killed in an attack that would change our world. Today we commemorate the 10th anniversary of Sept. 11 by remembering the past and reflecting on how to build our future.

At Legacy.com, we've devoted a lot of time over the past decade to remembering and honoring the victims of the 9/11 attacks. Just days after, we created a 9/11 memorial site where we posted individual profiles and condolence books for each of the victims. The memorial also included a national Book of Remembrance, where people could leave sympathy messages all victims and their families. To date the National Book of Remembrance has received almost 30,000 messages. And people far and wide continue to write messages in the national and individual remembrance books every single day, not just on anniversaries.

But September is when our collective thoughts turn most to the 9/11 attacks, particularly this year as the 10th anniversary reminds us that thousands of days can go by in the blink of an eye. At Legacy.com, we have spent the past week remembering and reflecting. We've published many stories and reflections, from intensely personal memories, to a tribute to 9/11's first responders, to a glimpse at how the NFL will handle its 9/11 opening day.

There are so many ways to remember 9/11, and so many things to say about that day. We've said just a few of them, but we hope we've helped our readers as they mourn and heal.