A member of the German wireless police picks up signals on the radio equipment he carries on his back, while his colleague takes notes. (Photo by General Photographic Agency/Getty Images). Circa 1925

People make their way on an algae-covered beach in Qingdao, Shandong province, China, July 19, 2015. (Photo by Reuters/Stringer)

José Pereira de Souza plays an accordion as actress and model Tatiana Melo gives a television interview in Feira Nordestina outside of the Olympic periphery on Wednesday, August 17, 2016. (Photo by Aaron Ontiveroz/The Denver Post)

A devotee pulls a chariot during the Hindu festival of Thaipusam in Singapore February 9, 2017. (Photo by Edgar Su/Reuters)

A person viewing the Northern lights over the lava landscape, Reykjanes Peninsula, Iceland. (Photo by Arctic-Images/Getty Images)

A reveller walks through the streets in the early hours during traditional May Day celebrations in Oxford, Britain, May 1, 2015. (Photo by Dylan Martinez/Reuters)

A child parades on a float during the Bun Festival on May 25, 2015 in Hong Kong, Hong Kong. One of Hong Kong's most colourful cultural celebration event, Cheung Chau Bun Festival, will be staged on 25 May 2015 (Monday) till 26 May 2015 midnight (Tuesday). This festival has over 100 years of history. Every year, thousands of people descend upon the tiny island for The Piu Sik (Floating Colours) Parade, Lucky Bun (Ping On Bun) and The Bun Scrambling Competition, the ancient custom during the festival. (Photo by Lam Yik Fei/Getty Images)

Two office workers wearing summer kimonos Yukata look at paper lanterns as they visit on the eve of Mitama Matsuri, a summer festival at Yasukuni Shrine in Tokyo, Japan, 13 July 2015. About 300,000 people visit the shrine decorated with about 30,000 lanterns during the three-day summer festival aiming at comforting souls of dead, especially for the war dead. The festival is after Japan's Buddhist custom to honor and comfort souls of family's ancestors. (Photo by Kimimasa Mayama/EPA)