On Saturday, New Yorkers watch the Tribute in Light, shining to commemorate the victims who died after the 11 September, 2001 terror attacks.
The two beams, shining from projectors installed on the roof of the Battery Parking Garage south of the 9/11 Memorial in New York City, are four miles high, shaped like the original towers.
The installations were first made six months after the tragic day 20 years ago and since then the lights have shone every year since then, throughout the night on 11 September.
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