THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

It's been 17 years since the attacks of September 11, 2001. But for millions of Americans, haunting memories of that day are still fresh, and many lives were changed forever. Every year, we look back on that tragic day through the lenses of photographers who captured the attack and its aftermath.

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THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

THIS weekend marks 15 years since the tragic events of 9/11, but these powerful images remain etched in the world’s memories. Nearly 3,000 innocent people died in the horrific terrorist attacks in …

We look back at some of the most unforgettable photos from the September 11 attacks — and tell the stories behind them.

"The 45 Most Powerful Images Of 2011", according to BuzzFeed. How many of these moments do you recognize? Which one do you find most compelling? And do you think BuzzFeed missed anything? Leave your anwsers in the comments below. Robert Peraza, who lost his son Robert David Peraza in 9/11, pauses at his son’s name at the North Pool of the 9/11 Memorial. (Getty Images / Justin

On Sept. 11, 2001, first responders faced imminent danger and rescued countless lives. Many of them still live with the devastating health effects from that day, but their heroic legacy has not been forgotten.

It's been 17 years since the attacks of September 11, 2001. But for millions of Americans, haunting memories of that day are still fresh, and many lives were changed forever. Every year, we look back on that tragic day through the lenses of photographers who captured the attack and its aftermath.

Aerial pictures, many never seen before, of the September 11 2001 attacks on the World Trade Center in New York City.

Nearly 3,000 people lost their lives on Sept. 11, 2001, in coordinated attacks on the World Trade Center and Pentagon and a crash in Shanksville, Pennsylvania.