A light art work titled “The Cracks” by Karolina Howorko is seen during the Amsterdam Light Festival in Amsterdam, Netherlands, Wednesday, November 27, 2019. The theme of the open air exhibition is “DISRUPT!”, and the art works are exhibited from 28 Nov. to 19 Jan. 2020. (Photo by Peter Dejong/AP Photo)





The Palm House at Kew Gardens is illuminated with a light show during a preview for the Christmas at Kew event on November 19, 2019 in London, England. (Photo by Jim Dyson/Getty Images)





A general view of Matera's Sassi limestone cave dwellings in southern Italy on April 30, 2015. With its “Sassi” limestone cave dwellings dug into the hillside and cascading in gravity-defying fashion down a steep slope towards the Gravina river, Matera is one of the Italian cities that time forgot. (Photo by Tony Gentile/Reuters)





Singapore's national flag hangs at half mast to mourn the passing of former president S.R. Nathan at the parliament house in Singapore August 23, 2016. (Photo by Edgar Su/Reuters)





The Griffith Park Observatory is pictured in Los Angeles, California, U.S. August 24, 2016. (Photo by Mario Anzuoni/Reuters)





Lower Manhattan is reflected in the Empty Sky memorial on the morning of the 15th anniversary of the 9/11 attacks in New Jersey, U.S., September 11, 2016. (Photo by Andrew Kelly/Reuters)





A television tower is silhouetted against sunset on a city general view, Almaty, Kazakhstan, September 18, 2016. (Photo by Shamil Zhumatov/Reuters)





A general view of Threadneedle Street and the Bank of England in the City of London at night November 14, 2016. (Photo by Kevin Coombs/Reuters)





A general view show the illuminated Eiffel Tower and the skyline of La Defense business district (Rear) at night in Paris, France, November 28, 2016. (Photo by Charles Platiau/Reuters)





Cars stand bumper to bumper in the evening rush hour traffic jam in central Beijing, China, December 8, 2016. (Photo by Thomas Peter/Reuters)





The skyline is seen as the sun goes down late in the afternoon in Frankfurt, Germany December 10, 2016. Picture taken December 10, 2016. (Photo by Kai Pfaffenbach/Reuters)





A Turkish flag is projected on the historical Galata Tower in tribute to the victims of Saturday's blasts, in Istanbul, Turkey, early December 12, 2016. (Photo by Murad Sezer/Reuters)





Christmas lights are seen in Madrid, Spain December 21, 2016. (Photo by Juan Medina/Reuters)





Christmas holiday lights hang from trees to illuminate the rue Royale in front of the Place de la Concorde, the Luxor Obelisk and the Dome des Invalides as part of illuminations for the Christmas holiday season in Paris, France, December 22, 2016. (Photo by Charles Platiau/Reuters)





A general view of the famous landmark “Elbphilharmonie” (Philharmonic Hall), which will open its doors to the public on January 11, in downtown Hamburg, Germany January 2, 2017. (Photo by Fabian Bimmer/Reuters)





A carousel is seen outside the Royal Palace in Madrid, Spain January 16, 2017. (Photo by Juan Medina/Reuters)





Vehicles are seen through a window as they drive on Guomao Bridge during rush hour in Beijing, China, November 7, 2016. (Photo by Jason Lee/Reuters)





The Royal Castle is seen a veil of heavy winter smog in Budapest, Hungary January 30, 2017. (Photo by Laszlo Balogh/Reuters)





A full moon “supermoon” rises in between four towers in a skyscrapers area in Madrid, Spain, January 31, 2018. (Photo by Paul Hanna/Reuters)