Each September, two large beams of light reach into the night sky above Manhattan's Financial District in powerful tribute to the towers that once defined the city's skyline.
In total, 2,977 victims lost their lives and, more than two decades later, their loved ones continue to gather to recite their names at the 9/11 Memorial at the World Trade Center complex in New York.
Photos show how the attacks changed Manhattan's skyline, and how the Financial District rebuilt ground zero.
This year marks the 23rd anniversary of the 9/11 attacks. The World Trade Center site has become a memorial to the 2,977 lives lost.
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