Tribute in Light is an art installation that is produced annually in New York on the anniversary of the September 11, 2001 attacks. Tribute in Light illuminates the New York City sky just south of the Memorial site. On 9/11, the 9/11 Memorial plaza is open to the public from 3 p.m. to midnight for the viewing of Tribute in Light.
The illuminated memorial reaches four miles into the sky and is visible within a 60-mile radius on a clear night.
It's assembled each year on the roof of the Battery Parking Garage near the World Trade Center site and was first illuminated on March 11, 2002, six months after the attacks.
It's comprised of 88 7,000-watt xenon light bulbs positioned into two 48-foot squares, echoing the shape and orientation of the Twin Towers.