Even though 11 years have past since the tragic actions of Sept. 11, 2001, most of us can't forget the tragic events that occurred that Tuesday morning.

New York resident Marijo O'Grady, MD, who spent time on Sunday visiting the World Trade Center Memorial, witnessed both planes crash into the towers.

"While at work, I heard a loud noise outside the window," said O'Grady, who works on the ninth floor of an office building located next to the trade center towers. "The next thing I saw was a big fire ball."

Worried for her family, who live on the 16th floor of an adjacent high-rise, O'Grady called them and told them to stay inside.

"At first, everyone thought it was an accident, not a terrorist attack," added O'Grady.

"Mommy, city gone?" said O'Grady, as she recalled the words of her 1-year- old son as he looked out the window of their apartment.

"I remember the strong smell of gasoline and everyone running," added O'Grady.

Pointing out the loss of power to the areas surrounding the trade center, she added, "It was chaotic, "I didn't even know about the Pentagon being hit until a few days later."

Her recollection was just one of many, as the world watched in disbelief as four hijacked planes crashed into both towers of the North and South Trade Center, the Pentagon in Arlington, Va., and into a field near Shanksville, Pennsylvania.

Ultimately, 2,752 death certificates were filed relating to the 9/11 attacks.

In addition to the creation of three National Memorials built at each site, many communities throughout the nation come together every year on Sept. 11 to remember all the victims lost during the attacks.