Pro-Russian activists attack policemen guarding the burned trade union building in the southern Ukrainian city of Odessa on May 3, 2014. More than 30 people were killed in a “criminal” blaze in Ukraine's southern city of Odessa, as violence spread across the country during the bloodiest day since Kiev's Western-backed government took power. Ukraine's interior ministry said at least 31 people had died in the fire Friday, with local media reporting that pro-Russian militants were believed to have been in the burning building at the time. (Photo by Anatolii Stepanov/AFP Photo)

Festival goers splash through a muddy puddle at Worthy Farm in Somerset, on the third day of the Glastonbury music festival June 27, 2014. (Photo by Cathal McNaughton/Reuters)

In this November 11, 2017 photo, children dressed in traditional outfits play during the Azorean Culture Festival which celebrates the culture of the Azores, the Portuguese island chain in the mid-Atlantic, in Enseada de Brito, in Brazil's Santa Catarina southern state. “We have to make sure that our culture always stays alive, not let it die”, said Andre Cordeiro, who leads one of the singing and dancing groups that performed this year. “We are able to pass it on from generation to generation”. (Photo by Eraldo Peres/AP Photo)

Two and a half year-old Jennifer Martin in tears during a visit to Santa at Harrods department store in London, 10th December 1949. (Photo by William Vanderson/Fox Photos/Hulton Archive/Getty Images)

In this January 11, 2018 photo, a skater jumps a ramp during the inauguration of a new recreational space for skateboarders, created in an abandoned gym at the Educational complex Ciudad Libertad, a former military barracks that the late Fidel Castro turned into a school complex after the revolution in Havana, Cuba. Foreign skateboard enthusiasts supply their Cuban counterparts with boards and other equipment. (Photo by Ramon Espinosa/AP Photo)

A journalist reports on a ladder outside the Great Hall of the People during the opening session of the National People's Congress (NPC) in Beijing, China March 5, 2018. The NPC has over 3,000 delegates and is the world's largest parliament or legislative assembly though its function is largely as a formal seal of approval for the policies fixed by the leaders of the Chinese Communist Party. The NPC runs alongside the annual plenary meetings of the Chinese People's Political Consultative Conference (CPPCC), together known as “Lianghui” or “Two Meetings”. (Photo by Thomas Peter/Reuters)

Storks that were saved by Bulgarian farmer Safet Ismail are pictured in the village of Zaritsa, Bulgaria, March 21, 2018. Dozens of people from villages in north-eastern Bulgaria took storks to their houses as a lot of the birds got injured due to freezing temperatures and snowfalls in the area over the last few days. (Photo by Stoyan Nenov/Reuters)

Praia du Forte, Bahia. “This was the lead picture for a National Geographic story on Bahia, because it was both mysterious as well as a “geography” picture showing where the slaves arrived from Nigeria. Beach pictures seem like they should be easy to take, but for me they are actually quite difficult. Too easy to fall into cliche. When I saw the kid coming on the horse, I quickly ran to see if I could make something with a woman in a bikini that was not a bikini shot”. (Photo by David Alan Harvey/The Guardian)