Children attend a war safety awareness class conducted by civil defence members, in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 14, 2016. (Photo by Khalil Ashawi/Reuters)

In this Sunday, March 29, 2015 photo, a young performer from the Parinacochas district of Ayacuhco dances in the Vencedores de Ayacucho dance festival, in the Acho bullring in Lima, Peru. The performers sang in the Quechua language, portraying the planting of corn and potatoes. From very young children to elderly people dressed as farmers, tigers, and foxes, as well as members of auto-defense groups, soldiers and police officers, to portray the violence that tore apart their families and communities. (Photo by Rodrigo Abd/AP Photo)

Ten segments of the Berlin Wall, which constitute the longest stretch outside of Berlin, are seen on display in Los Angeles, California September 18, 2014. On November 9, Germany will celebrate the 25th anniversary of the fall of the Berlin Wall. To mark the event Reuters Photographers around the world captured images of segments of the wall, which are kept as monuments in many countries from Taiwan to South Africa and Costa Rica. (Photo by Mario Anzuoni/Reuters)

An ancient oak tree sits in a Shropshire field as the first signs of Spring begin to show across the United Kingdom on February 19, 2014 in Bridgnorth, England. (Photo by Christopher Furlong/Getty Images)

A girl runs from waves crashing over the promenade on December 24, 2015 in Blackpool, England. The Met Office is warning of 80mph winds and torrential downpours over the Christmas holidays, as dozens of flood alerts are issued for already devastated regions. (Photo by Nigel Roddis/Getty Images)

Residents watch volcanic smoking and ashes rising from Mount Sinabung during an eruption in Karo, North Sumatra, Indonesia, February 24, 2016. Authorities have repeatedly called on local residents to remain patient in dealing with the impact of Sinabung's eruptions, which some experts have predicted will continue for five more years. (Photo by Xinhua/Barcroft Media)

Police are highly visible at the Notting Hill carnival with several arrests, stop and search and a “knife detection gate” in operation, August 27, 2018 in west London, England. 133 arrests were made at the carnival yesterday with 20 knives seized. (Photo by South West News Service/Action Press/Picturedesk)

Revelers dressed as Santa Claus or in festive costumes arrive for the start of SantaCon 2018 in New York City December 8, 2018. SantaCon is an annual event where people dress as Santa Claus or other Christmas characters parade in several cities around the world. (Photo by Timothy A. Clary/AFP Photo)