If you're more than 25 chances are you remember where you were 20 years ago today.
On 9/10 I was delayed disembarking from a cruise ship due to a bomb threat at the Miami port. The next day I was off and futzing around the house when my wife called me and said to turn on the news. The north tower had just been hit and I was in disbelief. Having lived in NYC the Twin Towers was the first landmarks I visited, so it was very personal. We all know what happened after that, but one thing people forget was all the rumors and false reporting. I remember hearing radio reports that Atlanta would be attacked and a bomb had gone off in the Capitol building. It was a chaotic and frenzied day with the fog of war hovering over our heads.
To all those who lost love one's on 9/11 and those who later died as a result of rescue efforts and subsequent military engagements, we honor you on this day and everyday. Your sacrifice will never be forgotten!
BTW - If you haven't seen the National Geographic / 9/11 Memorial Museum documentary (9/11: One Day In America) that was recently released - I highly recommend it. Some of the human interest stories are remarkable.