This devastating aerial image freezes the exact moment one of the Twin Towers collapses — a massive, violent cloud of pulverized concrete and debris exploding outward with unimaginable force.
The destruction is staggering. A thick, suffocating wave engulfs Lower Manhattan, spilling across the water like a tidal surge, swallowing everything in its path. The skyline nearly vanishes beneath the storm of dust and chaos.
ETCHED IN OUR HEARTS FOREVER: September 11, 2001 — a day of unthinkable loss and unbreakable spirit. 
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— at 9/11 Memorial, World Trade Center, New York City.
