The Tribute in Light is an art installation created in remembrance of the September 11 attacks.  It consists of 88 vertical searchlights arranged in two columns of light to represent the Twin Towers. It stands six blocks south of the World Trade Center on top of the Battery Parking Garage  in New York City. Tribute in Light began as a temporary commemoration of the attacks in early 2002, but it became an annual event, currently produced on September 11 by the Municipal Art Society of New York.    The Tribute in Light was conceived by artists John Bennett, Gustavo Bonevardi, Richard Nash Gould, Julian LaVerdiere, and Paul Myoda, and lighting consultant Paul Marantz. 
On clear nights, the lights can be seen from 60 miles (97 km) away,  visible in all of New York City and most of suburban Northern New Jersey and Long Island. The lights can also be seen in Fairfield County, Connecticut, as well as Westchester, Orange, and Rockland counties in New York.[ citation needed ]
The two beams cost approximately $1,626 (assuming $0.11 per kWh) to run for 24 hours. The 88 xenon spotlights (44 for each tower) each consume 7,000 watts.  As of 2011 [update] , the annual cost for the entire project was about $500,000. 
A similar Tribute in Light has also appeared on occasion at the Pentagon in Arlington County, Virginia, across the Potomac River from Washington, D.C., which was also targeted during the 9/11 attacks.
After the September 11 attacks, several people independently conceived the idea of using lights for remembrance. These efforts were merged under the umbrella of the Municipal Art Society and Creative Time. 
Tribute in Light initially ran as a temporary installation from March 11 to April 14, 2002, and it ran again on September 11, 2003, to mark the second anniversary of the attack.  Since then, it has been repeated every year on September 11. It was announced that 2008 would be its final year,  but the tribute was continued in 2009. 
On December 17, 2009, it was confirmed that the tribute would continue through the tenth anniversary of the attacks in 2011.  In 2012, plans were underway for the National September 11 Memorial & Museum to assume the lease for the MTA property used during this tribute, and to begin transitioning operation of the tribute from the Municipal Art Society to the memorial foundation. 
The lights are produced by an Italian company named Space Cannon,  which sends a team every year to help with the installation.  A Las Vegas-based company, Light America, was also part of the team who implemented the project. 
Each year, about 30 technicians, electricians, and stagehands work for about ten days to install the lights. During a testing phase of several days, observers in Brooklyn, Staten Island, New Jersey, and uptown Manhattan help make sure that the beams are adjusted accurately. 
The project was originally going to be named Towers of Light, but the victims' families felt that the name emphasized the buildings destroyed instead of the people killed. 
A permanent fixture of the Tribute in Light was at one point intended to be installed on the roof of One World Trade Center,   but it was not included in the finished design. 
Since 2008, the generators that power Tribute in Light have been fueled with biodiesel made from used cooking oil collected from local restaurants. 
The light pollution from Tribute in Light has caused confusion for over a million migrating birds, trapping them in the beams.  Even at an altitude of several miles, birds can be affected by the lights.  As a result of this effect, the beams are switched off for 20-minute periods to allow the birds to escape.  To ensure the lights do not affect migrating birds, the Municipal Art Society works with the New York City Audubon on the illumination.  A 2017 study found that the installation "dramatically altered multiple behaviors of nocturnally migrating birds—but these effects disappeared when lights were extinguished".  
Tribute in Light was featured in Boyz II Men's music video for "Color of Love". It made a notable appearance during the opening credits of Spike Lee's 2002 film 25th Hour . The tribute was also shown and referenced in the CBS series Blue Bloods . These lights were featured in the music video of U2's "You're the Best Thing About Me".
The video game adaptation of the film Spider-Man 2 features the lights at the approximate location of the WTC site, while another video game adaptation of the film The Amazing Spider-Man 2 , the lights are seen on the construction site of One World Trade Center at night.
The first memorials to the victims of the September 11 attacks in 2001 began to take shape online, as hundreds of webmasters posted their own thoughts, links to the Red Cross and other rescue agencies, photos, and eyewitness accounts. Numerous online September 11 memorials began appearing a few hours after the attacks, although many of these memorials were only temporary. Around the world, U.S. embassies and consulates became makeshift memorials as people came out to pay their respects.
A searchlight is an apparatus that combines an extremely bright source with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction. It is usually constructed so that it can be swiveled about.
The World Trade Center site, often referred to as "Ground Zero" or "the Pile" immediately after the September 11 attacks, is a 14.6-acre (5.9 ha) area in Lower Manhattan in New York City. The site is bounded by Vesey Street to the north, the West Side Highway to the west, Liberty Street to the south, and Church Street to the east. The Port Authority of New York and New Jersey (PANYNJ) owns the site's land. The original World Trade Center complex stood on the site until it was destroyed in the September 11 attacks.
The National September 11 Memorial & Museum is a memorial and museum in New York City commemorating the September 11 attacks of 2001, which killed 2,977 people, and the 1993 World Trade Center bombing, which killed six. The memorial is located at the World Trade Center site, the former location of the Twin Towers that were destroyed during the September 11 attacks. It is operated by a non-profit institution whose mission is to raise funds for, program, and operate the memorial and museum at the World Trade Center site.
A monument is a type of structure that was explicitly created to commemorate a person or event, or which has become relevant to a social group as a part of their remembrance of historic times or cultural heritage, due to its artistic, historical, political, technical or architectural importance. Some of the first monuments were dolmens or menhirs, megalithic constructions built for religious or funerary purposes. Examples of monuments include statues, (war) memorials, historical buildings, archaeological sites, and cultural assets. If there is a public interest in its preservation, a monument can for example be listed as a UNESCO World Heritage Site.
The Sphere is a monumental cast bronze sculpture by German artist Fritz Koenig (1924–2017).
A Symphony of Lights is a daily light and sound show across the Victoria Harbour in Hong Kong. It is the world's largest permanent light and sound show according to Guinness World Records. As of 2017, there were 42 participating buildings in the show.
The Pentagon Memorial, formally the National 9/11 Pentagon Memorial, located just southwest of The Pentagon in Arlington County, Virginia, across the Potomac River from Washington, D.C., is a permanent outdoor memorial to the 184 people who died as victims in the building and on American Airlines Flight 77 during the September 11 attacks.
The World Trade Center Site Memorial Competition was an open, international memorial contest, initiated by the Lower Manhattan Development Corporation (LMDC) according to the specifications of the architect Daniel Libeskind, to design a memorial for the World Trade Center site at the under-construction World Trade Center in New York City. The competition began April 28, 2003 and the winner—Michael Arad and Peter Walker's Reflecting Absence—was revealed January 14, 2004, in a press conference at Federal Hall National Memorial. The contest garnered 5,201 entries from 63 nations and 49 U.S. states, out of 13,683 registrants from all 50 U.S. states and 94 nations, making it the largest design competition in history.
The World Trade Center cross, also known as the Ground Zero cross, is a formation of steel beams found among the debris of the World Trade Center site in Lower Manhattan, New York City, following the September 11 attacks in 2001. This set of beams is so named because it resembles the proportions of a Christian cross. The beams have been part of an exhibit at the September 11 Museum since 2014.
One World Trade Center is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City. Designed by David Childs of Skidmore, Owings & Merrill, One World Trade Center is the tallest building in the United States, the tallest building in the Western Hemisphere, and the seventh-tallest in the world. The supertall structure has the same name as the North Tower of the original World Trade Center, which was destroyed in the terrorist attacks of September 11, 2001. The new skyscraper stands on the northwest corner of the 16-acre (6.5 ha) World Trade Center site, on the site of the original 6 World Trade Center. It is bounded by West Street to the west, Vesey Street to the north, Fulton Street to the south, and Washington Street to the east.
The following list contains dates beyond October 2001 involving the September 11 attacks.
The Cathedral of Light or Lichtdom was a main aesthetic feature of the Nazi Party rallies in Nuremberg from 1934 to 1938. Designed by architect Albert Speer, it consisted of 152 anti-aircraft searchlights, at intervals of 12 metres, aimed skyward to create a series of vertical bars surrounding the audience. The Cathedral of Light was documented in the Nazi propaganda film Festliches Nürnberg, released in 1937.
Walter D'Arcy Ryan was an influential early lighting engineer who worked for General Electric as director of its Illuminating Engineering Laboratory. He pioneered skyscraper illumination, designed the Scintillator colored searchlights display, and was responsible for the lighting of the Panama-Pacific International Exposition in San Francisco and the Century of Progress Exposition in Chicago, in addition to the first complete illumination of Niagara Falls. He combined illumination into both an art and a science.
Spectra is the name of a series of art installations by Ryoji Ikeda which use intense white light as a sculptural material. The most recent presentation of spectra was in Hobart, Tasmania, Australia for four days ending 24 June, 2018 to mark the winter solstice, and as an installation piece at the Dark Mofo festival held by MONA. spectra [Amsterdam] was the first presentation of the work in 2008 its current form; an array of xenon lamps pointed skywards lit from dusk till dawn accompanied by a mathematically derived score audible from each of the lamp bases. The work was first commissioned and produced by Forma Arts.
The World Trade Center (WTC) is a mostly completed complex of buildings in the Lower Manhattan neighborhood of New York City, U.S., replacing the original seven buildings on the same site that were destroyed in the September 11 attacks. The site is being rebuilt with up to six new skyscrapers, four of which have been completed; a memorial and museum to those killed in the attacks; the elevated Liberty Park adjacent to the site, containing the St. Nicholas Greek Orthodox Church and the Vehicular Security Center; and a transportation hub. The 94-story One World Trade Center, the tallest building in the Western Hemisphere, is the lead building for the new complex.
The Lindbergh Beacon, an aircraft beacon atop the Los Angeles City Hall, operated nightly from April 26, 1928, until just after the attack on Pearl Harbor. It was restored to its original condition in 2001, and Los Angeles magazine described it as "a tiara of light atop our beautifully restored Los Angeles City Hall." City officials now occasionally put the beacon into operation for special occasions such as the year-end holidays.
An estimated $110 million of art was lost in the September 11 attacks: $100 million in private art and $10 million in public art. Much of the art was not insured for its full value.
The Jersey City 9/11 Memorial is located on the Hudson River Waterfront Walkway at the foot of Grand Street in Paulus Hook near Exchange Place in Jersey City, New Jersey. It comprises three components: a sculpture of steel girders from the original World Trader Center, an inscribed black granite stele, and Makeshift Memorial. The site on the Hudson Waterfront opposite the World Trade Center site was a triage set up during the '9/11 boatlift' and thereafter became a staging area for rescue operations.
New York City is home to a large birding community and diverse range of bird species. Though it is the most populous and most densely populated city in the United States, NYC is home to a range of ecological habitats and is situated along the Atlantic Flyway, a major route for migrating birds. More than 400 species have been recorded in the city, and their concentration in the city's urban parklands, forests, marshes, and beaches has made birding a popular activity in the city, especially after the start of the COVID-19 pandemic.
Coordinates: 40°42′39″N74°00′52″W / 40.71096°N 74.01440°W